Marinate the marinade ingredients with the meat/chicken for a good few hours (preferably 6 or more), cover and keep refrigerated.
Preheat oven 250 C for 30 minutes.
Meanwhile, fill a pot with water and put on full heat, no lid. Add the 1 3/4 tsp full salt, 1 tsp full cumin seeds and 2 tsp oil. Once water is boiling, add 1 3/4 cup rice and wait until the water comes to a boil again (around 10 minutes). Let the rice boil in the boiling water until half-cooked (around 5 minutes). The rice should be very slightly puffy but not fully cooked.
Empty most of the pot out into a sieve (over the sink), leaving a thin layer of loosely-spaced rice (with lots of gaps) at the bottom of the pot.
Lay the marinated meat/chicken on the rice layer and even it out.
Pour 1/4 cup water into the marinade bowl, swish it around and then sprinkle over the meat/chicken.
Slowly add the rest of the rice on top, and even out.
Take the end of a large wooden spoon, and stab holes into the rice that reach all the way to the bottom of the pot. There should be a smattering of holes all over the rice.
Slice 60g butter and spread all over the rice.
Drizzle 1/2 serving spoon olive oil over the top.
Seal the opening of the pot with foil so it becomes air-tight. Then lid the pot, place on the hob and put on full heat, until the lid steams up (the mixture is boiling and steam should escape from the lid). If making a small amount with a wide pot, place the pot on a tawa when heating up so the marinade doesn't burn.
Place the pot in the oven and lower the setting to Gas Mark 2 1/2 [155 C] - 3 [160 C] (if making a large amount, use 3). Leave until cooked (1-1.5 hours for chicken, 2 hours for meat). If you wish, you can instead cook on low heat on the hob (resting on a tawa) for 1 hour, and then place in the oven, reducing the oven time by half.