Submerge 500 g basmati rice in water and leave to soak for 45 minutes.
Bring a large pot of water to a rolling boil. Stir in the potato boiling spices and salt to taste, then drop in 1800 g potato. Boil for 10 minutes until half-cooked, drain thoroughly, and dry the surface with kitchen towels.
Heat 81–108 g vegetable oil in a deep pan to 180°C (350°F). Deep-fry the potatoes for 2–3 minutes until lightly gilded, then transfer to paper towels to drain.
Prepare the aromatic potli spices by crushing them coarsely and tying them securely inside a square of muslin with kitchen twine, leaving excess string to hook onto the pot handle.
Melt 39.6 g ghee in a wide saucepan over medium heat. Tip in the cumin for the liquor and fry for about 1 minute until sputtering and aromatic. Pour in 124 g vegetable stock and bring the liquid to a boil.
Lower the heat to low. Whisk in 61.2 g yogurt, 12 g green chilli, 7.6 g lemon juice, and the yellow chilli powder for the liquor. Simmer gently for 5 minutes, then take the pan off the heat.
In a separate large pot, bring roughly 1.5 litres of water to the boil with salt to taste and the pouch of aromatic potli spices. Tip in the drained rice, bring back to the boil, and turn the heat to medium. Add 7.6 g lemon juice and cook for about 18 minutes, stirring occasionally, until three-quarters cooked. Drain, discard the spice pouch, and set the rice aside.
To layer the tehari, spoon half of the prepared liquor into the bottom of a heavy cooking pot. Cover with a third of the cooked rice, then arrange half of the fried potatoes across the surface. Add another third of the rice, the remaining potatoes, and finish with the final third of rice. Pour the remaining liquor evenly over the top.
Place a tight-fitting lid on the pot and seal the seam completely with 150 g dough. Set over low heat to steam undisturbed for 25–30 minutes, then crack open the crust to serve.
Steep a tiny pinch (0.1 g per 2 g turmeric) in 2 tbsp warm water; use to match the rich golden hue. Contributes an aristocratic, honeyed floral flavour rather than earthy bitterness.
Use 1 g ground for 4 g whole (or 1 small pinch per 2 to 3 whole cloves). Add with spice powders; disperses intense warmth quickly, so use with restraint.
Allspice berries
Use 100% of the weight whole in tempering. Imparts a warm, clove-like aromatic profile combined with hints of nutmeg and cinnamon.
Use about a third of the weight (0.5 g ground for a 2.5 cm piece), stirred in with the ground spices rather than fried whole, since the powder burns quickly.
Use 120% of the weight; melt gently over low heat to avoid burning the milk solids, which will yield a softer, creamier richness rather than a nutty aroma.
Use 100% of the weight. Add an extra pinch of salt and simmer with a bruised bay leaf or a slice of ginger; the gravy will taste cleaner but slightly less savoury.