Guntur is chilli country, and when the fields turn red between January and March, Andhra kitchens buy fresh, fully ripe red chillies by the kilo for this pachadi. The chillies are chopped, salted and packed with tamarind for two days, then ground coarse with roasted fenugreek and sealed under a tempering of gingelly oil, mustard and hing. The result is brick red, fiery and fruity rather than smoky, with a sour backbone from the tamarind and a faint bitterness from the methi. A teaspoon is mashed into hot rice with a spoon of ghee or sesame oil, and it is just as good beside idli, dosa or pesarattu. The big mistake is washing the chillies and grinding them while still damp: water is what makes this pachadi spoil, so wipe them dry and leave them on a cloth for a few hours. It is ready when the paste is thick and glossy and the oil pools on top. Salt here is high on purpose, about 12 g for every 100 g of chillies, and the tamarind makes it acidic; even so, keep it in the fridge, where it lasts up to 6 months. Chef's tip: mix in a few Byadgi or Kashmiri chillies with the hot Guntur ones for a deeper red without extra fire.