vanilla yogurt or plain yogurt

Yogurt is a fermented dairy product made by introducing live bacterial cultures (primarily Lactobacillus bulgaricus and Streptococcus thermophilus) to milk, causing lactose fermentation and resulting in a tangy, custard-like product. Plain yogurt contains only milk and cultures, while vanilla yogurt includes vanilla flavoring (natural or artificial) and often added sweeteners. The fermentation process creates lactic acid, which lowers the pH and gives yogurt its characteristic sour taste and thick texture. Yogurt originated in the Middle East and Central Asia, with evidence of production dating back thousands of years. Modern yogurts vary in fat content (nonfat, low-fat, and full-fat), texture (liquid, set, or stirred), and straining level (regular, Greek-style, or labneh).

Plain yogurt serves as both a versatile cooking ingredient and table food across Mediterranean, Middle Eastern, Indian, and Balkan cuisines. It is used as a marinade base for meats, a cooling accompaniment to spiced dishes (raita, tzatziki), a baking ingredient for moist cakes and quick breads, and a substitute for sour cream or mayonnaise in dressings and sauces. Vanilla yogurt is primarily consumed as a breakfast or dessert item, often topped with granola, fruit, or nuts, and can be incorporated into smoothies, whipped into mousse-like preparations, or used in baking for added moisture and subtle flavor. Both plain and vanilla versions should be added to hot dishes at the end of cooking to prevent curdling, unless specifically cultured for heat stability.