Yogurt: cultures, texture and the first spoonful
How milk becomes yogurt, why set and strained styles differ, and where to begin.

Yogurt has its own place here, alongside skyr. A jar of gently set yogurt and a dense bowl of skyr may begin with milk, but their texture and the handling of the milk are worth exploring separately.
What the culture changes
Yogurt bacteria turn some milk sugar into lactic acid. As acidity develops, milk proteins form a gel: the milk sets. A live starter and suitable temperature are part of that process; leaving milk on a counter is not a yogurt method. University of Illinois Extension: Making yogurt at home
The Codex standard identifies the characteristic yogurt cultures as Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus. Other fermented milk products have their own cultures and definitions. A kefir culture is not simply a different brand of yogurt starter. FAO/WHO Codex: Standard for fermented milks
Set, stirred or strained?
Set
The gel forms in its container. Take a spoonful gently to notice how it holds together.
Stirred
Stirring breaks up the set structure. The result can feel softer even before anything is added.
Strained
Removing whey makes a thicker food. Straining finished yogurt is an extra step, not a requirement for every jar.
For a spread, explore labneh. Washington State University describes covered straining in the refrigerator and notes that stabilizers in some commercial yogurts can interfere with whey separation. Washington State University Extension: Yogurt made simple
A useful first project
Choose one complete method and the starter it specifies. Read its heating, cooling, incubation and chilling steps before starting; those steps work together. The Illinois guide linked below explains the full sequence. Use its measurements and timings rather than combining isolated tips from different recipes.
Three ways to enjoy a plain jar
Try it with oats and fruit, spoon it alongside roasted vegetables, or use it in a dressing written for plain yogurt. Taste a little on its own first. A note about thickness, tartness and your preferred serving is more useful than deciding which dairy food is universally best.
Next, compare eight cultured dairy foods, or explore what makes skyr a separate favourite.
Sources
- University of Illinois Extension: Making yogurt at home
- Washington State University Extension: Yogurt made simple
- FAO/WHO Codex: Standard for fermented milks
Sources checked 11 September 2026.
A new, independently written article at the address previously used for “Yogurt”.