While many ancient Indian recipes have been lost in history, one can look at ancient texts to see what was eaten in ancient and pre-historic India.
Barley—(known as Yava in both Vedic and Classical Sanskrit) is mentioned many times in Rigveda and other Indian scriptures as one of the principal grains in ancient India
Betel leaf—primary use is as a wrapper for the chewing of areca nut or tobacco, where it is mainly used to add flavour; may also be used in cooking, usually raw, for its peppery taste
Chickpeas—popular dishes are made with chickpea flour, such as mirchi bajji and mirapakaya bajji
Curd—a traditional yogurt or fermented milk product, originating from the Indian subcontinent, usually prepared from cow's milk, and sometimes buffalo milk, or goat milk
Ghee—a class of clarified butter that originated in ancient India, commonly used in the Indian subcontinent, Middle-Eastern cuisine, traditional medicine, and religious rituals
Grape wine—first-known mention of grape-based wines in India is from the late 4th-century BC writings of Chanakya
Honey—the spiritual and supposed therapeutic use of honey in ancient India was documented in both the Vedas and the Ayurveda texts
Mango—the Jain goddess Ambika is traditionally represented as sitting under a mango tree
Pomegranate—in some Hindu traditions, the pomegranate (Hindi: anār) symbolizes prosperity and fertility, and is associated with both Bhoomidevi (the earth goddess) and Lord Ganesha (the one fond of the many-seeded fruit)
Rice—cultivated in the Indian subcontinent from as early as 5,000 BC
Rose apple—mainly eaten as a fruit and also used to make pickles (chambakka achar)
Saffron—almost all saffron grows in a belt from Spain in the west to Kashmir in the east
Salt—considered to be a very auspicious substance in Hinduism and is used in particular religious ceremonies like house-warmings and weddings; in Jainism, devotees lay an offering of raw rice with a pinch of salt before a deity to signify their devotion, and salt is sprinkled on a person's cremated remains before the ashes are buried
Sorghum—commonly called jwaarie, jowar, jola, or jondhalaa, sorghum is one of the staple sources of nutrition
Sugar—produced in the Indian subcontinent since ancient times, its cultivation spread from there into modern-day Afghanistan through the Khyber Pass
Sugarcane—the earliest known production of crystalline sugar began in northern India; the earliest evidence of sugar production comes from ancient Sanskrit and Pali texts
Turmeric—used widely as a spice in South Asian and Middle Eastern cooking