How to make yogurt: a comprehensive guide

Category: fermentation,Learn

Yogurt, a creamy and tangy fermented dairy product, has been a staple in diets around the world for thousands of years. Its origins can be traced back to ancient civilizations, with some experts believing it was first discovered in Mesopotamia (current Iraq, as well as parts of Iran, Syria, and Turkey) around 5000 BCE. This fortuitous discovery probably occurred when milk stored in warm climates naturally fermented, creating a thicker, tangier and very tasty product that we now know as yogurt.

Over the centuries, yogurt has evolved from a simple method of preserving milk to a versatile food loved for its nutritional benefits and culinary applications. In this post, we’ll explore the fascinating world of yogurt-making, and provide you with the knowledge to create your own delicious homemade yogurt.

Understanding yogurt varieties

Before we dive into the yogurt-making process, it’s essential to understand that there is no one yogurt but in fact over 400 different types. These generally can be divided into the two main types: thermophilic and mesophilic. Both create yoghurt Each type requires different preparation methods and bacterial cultures, resulting in distinct flavors and textures.

Thermophilic yogurt

Thermophilic yogurt is the most common type found in grocery stores. It’s made using bacterial cultures that thrive in warm temperatures, typically between 43°C to 46°C (110°F to 115°F). It makes sense, thermo-phile means ‘heat loving’ Examples of thermophilic yogurts include:

These yogurts are known for their thick, creamy texture and tangy flavor. The higher incubation temperature results in a faster fermentation process, usually taking 4-8 hours.

Mesophilic yogurt

Mesophilic yogurt, on the other hand, is made with bacterial cultures that thrive at room temperature, typically between 21°C to 32°C (70°F to 90°F). These types of yoghurt have evolved in colder climates, such as Scandinavia or the Baltic states. Examples of mesophilic yogurts include:

These yogurts tend to have a milder, less tangy flavor and a thinner consistency compared to thermophilic varieties. The fermentation process for mesophilic yogurts is slower, often taking 12-24 hours.

Yogurt-making methods

Now that we understand the different types of yogurt, let’s explore the two primary methods for making yogurt at home: the backslopping method and the starter culture method. They both work for all mesophilic and thermophilic yoghurts, but have their pro’s and cons.

Backslopping method

Backslopping is a traditional technique where a small amount of previously made yogurt is used to inoculate a new batch of milk. This method has been used for centuries and is still popular in many households today.

Pros of backslopping:

  • Cost-effective, as you don’t need to purchase new starter cultures regularly

  • Maintains a consistent flavor profile over time

  • Preserves heirloom strains of bacteria

 

Cons of backslopping:

  • Risk of contamination if the previous batch wasn’t properly handled

  • Potential for weakening of culture over time, leading to inconsistent results

  • Limited variety of bacterial strains, you can only (re)create yoghurts that you can already buy

Starter culture method

The starter culture method involves using commercially prepared bacterial cultures to inoculate milk. This method has gained popularity in recent years due to its consistency and reliability.

Pros of using starter cultures:

  • Consistent results with each batch

  • Wide variety of culture options for different flavors and textures, create yoghurts at home that are normally not sold in your country.

  • Precise control over the bacterial strains in your yogurt

  • Reduced risk of contamination

  • Ability to create specific types of yogurt (e.g., Greek, Bulgarian, or probiotic-rich varieties)

  • Ideal for beginners or those who make yogurt infrequently

Cons of using starter cultures:

  • Slightly higher cost due to the need to purchase cultures regularly
  • Less connection to traditional methods

While both methods can produce delicious yogurt, using starter cultures offers more control and consistency in your yogurt-making process. This is especially important if you’re looking to create specific types of yogurt or want to ensure a high-quality product every time.

Tools and equipment

To make yogurt at home, you’ll need some basic equipment. While it’s possible to make yogurt with just a few kitchen items, having specialized tools can make the process easier and more consistent.

Essential tools:

  • Large pot for heating milk

  • Thermometer (digital or candy thermometer)

  • Whisk or spoon for stirring

  • Glass jars or containers for culturing and storing yogurt

  • Cheesecloth or fine-mesh strainer (for making thicker Greek-style yogurt)

Optional but helpful equipment:

A dedicated appliance that maintains a consistent temperature for culturing yogurt. Some advanced models offer multiple temperature settings, allowing you to make both thermophilic and mesophilic yogurts with ease.

Many modern electric pressure cookers have a yogurt-making function, which can simplify the process.

Can be used to maintain a consistent temperature during fermentation if you don’t have a yogurt maker.

This tool, that has been gaining popularity over the past years, can precisely control a water bath, in which the jars of yoghurt are being fermented

Having the right tools can significantly improve your yogurt-making experience, especially if you plan to make yogurt regularly. A reliable yogurt maker with adjustable temperature settings can be particularly valuable, as it allows you to experiment with different types of yogurt and achieve consistent results.

Step-by-step guide to making yogurt

Now that we’ve covered the basics, let’s walk through the process of making yogurt at home. We’ll provide instructions for both thermophilic and mesophilic yogurts, using both the starter culture and backslopping methods.

How to make thermophilic yogurt at home, step by step

Using a starter culture:

  • 1
    Choose your milk:

    – Any type of milk can be used, whole, 2%, or skim milk. Cows milk works best, though other types of animal milk will work too. The milk can be both raw, pasteurized or sterilized (UHT).

    – For a richer yogurt, add cream or milk powder

  • 2
    Heat the milk:

    – Warm the milk to about 80-90°C and keep it at this temperature for around 10 minutes to denature proteins. Please do not skip this step as your yoghurt will remain runny.
    PRO TIP: when using UHT milk, the heating fase is not necessary as the denaturing process already occurred during the UHT process.

  • 3
    Cool the milk:

    – Let the milk cool to between 43°C and 46°C (110°F to 115°F)

  • 4
    Add starter culture:

    – Follow the instructions on your chosen starter culture
    – Gently whisk the culture into the cooled milk

  • 5

    Incubate:
    – Maintain temperature at 43°C to 46°C (110°F to 115°F) for 4-8 hours
    – Use a yogurt maker, Instant Pot, or insulated cooler to maintain temperature

  • 6
    Check for doneness:

    – Yogurt should be set and have a tangy flavor

    – Longer incubation results in tangier yogurt

  • 7
    Refrigerate:

    – Cool yogurt in the refrigerator for at least 4 hours before consuming

    – For Greek-style yogurt, strain through cheesecloth to remove whey

How to make thermophilic yoghurt using the backslopping method:

Follow the same steps as above, but instead of a starter culture, use about a tablespoon of plain yogurt from your previous batch or a store-bought yogurt, per liter of milk. Ensure it’s plain yogurt without any additives such as fruits.

  • Side note: Stirred yoghurt

    It’s worth mentioning a unique variety of thermophilic yogurt that’s particularly common in Western Europe, known as “stirred yoghurt“. Unlike the thick, scoopable texture of Greek or Bulgarian yogurt, roer yoghurt has a more fluid consistency. It’s characterized by a smooth, somewhat slimy texture that’s not brittle like most other thermophilic yogurts.

    Stirred yoghurt is made using thermophilic cultures, but the fermentation temperature tends to be lower (around 32°C) and the post-fermentation handling is slightly different (it’s stirred, as you probably guessed) resulting in its distinctive texture. This type of yogurt is popular for its creamy mouthfeel and versatility in both sweet and savory applications.

How to make Mesophilic yogurt at home, step by step

Using a starter culture:

  • 1

    Choose your milk:
    – As with thermophilic yogurt, whole, 2%, or skim milk can be used

  • 2

    Heat the milk:
    – Warm the milk to about 80-90°C and keep it at this temperature for around 10 minutes to denature proteins. Please do not skip this step as your yoghurt will remain runny.

  • 3

    Cool the milk:
    – Cool the milk to about 30°C (86°F)

  • 4

    Add starter culture:
    – Mix in your mesophilic starter culture according to the package instructions
    – Gently whisk the culture into the cooled milk

  • 5

    Incubate:

    – Keep the milk mixture at room temperature, between 21°C to 32°C (70°F to 90°F), for 12-36 hours

    – A yogurt maker with adjustable settings is ideal, but a warm spot in your kitchen can work too

  • 6

    Check for doneness:

    – Yogurt should be set and slightly tangy

    – Remember, mesophilic yogurts are typically milder and thinner than thermophilic ones

  • 7

    Refrigerate:

    – Chill the yogurt for at least 4 hours before enjoying

Making mesophilic yoghurt using the backslopping method:

Follow the same steps as above, but use around 1 tablespoon of yogurt from your previous batch or a store-bought mesophilic yogurt with live cultures instead of a starter culture, per liter of milk.

Remember, the key to successful yogurt-making is maintaining the proper temperature during incubation. This is where a reliable yogurt maker can be invaluable, especially one with adjustable settings for both thermophilic and mesophilic cultures.

Conclusion: it’s really that easy!

Making your own yogurt at home is a rewarding and delicious endeavor. Whether you choose thermophilic or mesophilic varieties, the process allows you to control the ingredients, flavor, and texture of your yogurt. While the backslopping method has its charms, using high-quality starter cultures can provide more consistent and diverse results, especially for those new to yogurt-making.

With the right tools and a bit of practice, you’ll soon be creating creamy, tangy yogurt that rivals any store-bought variety. So why not give it a try? Your taste buds, wallet and your gut bacteria will thank you!

About Meneer Wateetons

Meneer Wateetons is a renowned Dutch foodwriter, teacher, fermentation specialist, sausage maker and the owner of startercultures.eu. He has written 9 books on culinary topics such as fermentation, alcohol making, sausages and charcuterie making and deep frying. He has taught many hobbyists, chefs and food professionals about these topics.

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