Yogurt

Yogurt is one of the most studied fermented foods in nutritional science. Its live bacterial cultures have been shown in multiple clinical studies to support gut microbiome diversity, improve lactose tolerance (the fermentation process breaks down much of the lactose), and reduce the duration of antibiotic-associated diarrhea.

The protein in yogurt is partially pre-digested by bacterial enzymes, making it more bioavailable than equivalent protein in fresh milk. Calcium in yogurt is also well-absorbed, partly due to the acidic environment created by fermentation.

Studies examining home-fermented dairy products have found a broader diversity of bacterial strains compared to industrial yogurt, which typically contains only the two legally required starter cultures.

Research into traditional Indian dahi specifically is less extensive than into commercial probiotics, but studies examining home-fermented dairy products have found a broader diversity of bacterial strains compared to industrial yogurt, which typically contains only the two legally required starter cultures.

The earthen pot setting method appears to support this diversity further. Hung curd (chakka), dahi that has been strained through cloth until very thick, functions similarly to Greek yogurt and is used in Indian cooking for shrikhand, a sweet dessert from Maharashtra and Gujarat made by mixing strained curd with sugar, saffron, and cardamom.

The fermentation of milk into curd is so ancient in South Asia that it appears in Vedic literature, where it was offered in religious rituals and described as one of the five products of the cow (panchagavya). Archaeological evidence suggests that dairy fermentation in the Indian subcontinent dates back at least 5,000 years, predating most written records.

Dahi has been a daily staple for millennia not because of any culinary theory but because of necessity: fermentation was the most reliable way to preserve milk in a hot climate before refrigeration.

The practice of setting curd in unglazed earthen pots (matka) persists in many households and street food stalls across India. The porous clay allows for slight evaporation, keeping the curd cool and imparting a subtle mineral quality to its flavor. This traditional method produces matka dahi, which many consider superior to refrigerator-set curd in both texture and taste.

The cultural specificity of dahi extends to ritual: in Hindu tradition, it is considered auspicious and is often offered to guests before important journeys, mixed with sugar as mishri dahi, a gesture of goodwill and blessing.

In South India, curd rice (thayir sadam) is not merely a dish but a daily closing ritual — the last item served in a traditional meal, eaten to cool the digestive system after a heavily spiced sequence of courses.

In South India, curd rice (thayir sadam in Tamil, mosaranna in Kannada) is not merely a dish but a daily closing ritual. It is the last item served in a traditional meal, eaten to cool the digestive system after a heavily spiced sequence of courses. For millions of South Indians, no meal is complete without it. The dish is deeply tied to identity and comfort: it appears at temple offerings, in school tiffin boxes, at hospital bedsides, and at family funerals alike.

Curd functions as a tenderizing marinade in Indian meat cookery: the lactic acid in yogurt gently denatures surface proteins, allowing spices to penetrate more deeply and producing juicier, more flavorful results after cooking. Tandoori chicken, seekh kebabs, and biryani meat all begin with a yogurt-based marinade.

In vegetarian cooking, the same principle applies when marinating paneer or vegetables before grilling.

As a cooking medium, curd is added to gravies and kormas, where it is incorporated in stages, stirred constantly to prevent curdling, and cooked down into a thick, slightly tangy sauce base.

Kadhi, a dish of yogurt cooked with chickpea flour into a soupy sauce with fried dumplings (pakoras), demonstrates curd as a primary ingredient rather than an accent.

Kadhi, a dish of yogurt cooked with chickpea flour into a soupy sauce with fried dumplings (pakoras), demonstrates curd as a primary ingredient rather than an accent. In raita, the curd is left raw and seasoned with cumin, salt, coriander, and vegetables, serving as a cooling, textural contrast to hot, spiced main dishes.

To set dahi at home, warm whole milk to approximately 43 to 45 degrees Celsius (just warm enough that a finger dipped in holds comfortably for 10 seconds). Add 1 to 2 teaspoons of live active curd from a previous batch (or plain commercial yogurt with live cultures) per 500 ml of milk.

Stir gently to distribute. Pour into a ceramic or earthen vessel, cover with a lid or cloth, and leave undisturbed in a warm spot for 6 to 8 hours (longer in winter, shorter in summer). Do not jostle or move the vessel during setting. Once set, refrigerate. Save a small portion to inoculate the next batch. The culture is self-perpetuating indefinitely.

Hung curd (chakka) is made by straining dahi through cheesecloth for 4 to 8 hours — the resulting thick curd can be used for shrikhand or as a substitute for cream cheese.

For hung curd (chakka), pour set dahi into a cheesecloth-lined strainer and suspend over a bowl in the refrigerator for 4 to 8 hours. The resulting thick curd can be used as a base for shrikhand or as a substitute for cream cheese in savory preparations.