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Put the steaks on a plate and rub them all over with the oil, chipotle paste and ½ tsp freshly ground black pepper. Leave at room temperature while you start the beans.
For the beans, soften the onion in the oil in a frying pan. Once softened, stir in the spices for 2 mins, followed by the tomato purée, chipotle, sugar and vinegar. Tip in all the beans with 1 tsp salt, some pepper and half a can of water. Bubble gently until the water is almost evaporated.
Heat a griddle or non-stick frying pan (or a barbecue). Season the steaks with salt. Fry, with the peppers alongside, for about 2 mins on each side, until the steaks are cooked to your liking and the peppers are charred. Lift the steaks onto a clean plate to rest for a few mins while you mash two-thirds of the beans. Stir in the whole beans and check the seasoning.
Slice the steaks. Spread a good pile of beans onto 2 plates, and top with sliced steak and peppers. Add the avocado, a big squeeze of lime juice, some coriander leaves, a good dollop of soured cream and a pinch more paprika, if you like.