Tarka turtle beans

350g black beans
1750mL water or beer
bay leaf

oil
black mustard seeds
cumin seeds
half onion, finely chopped
chilli flakes
ground smoked paprika
ground coriander
ground ginger
ground cocoa
three cloves garlic
lime juice
fresh coriander

Boil the beans over high heat for 10 minutes, then reduce the heat, partially cover and simmer with a bay leaf for 90-100 minutes until they are perfectly tender. In a separate small pan, heat a good amount of oil over high heat until it shimmers. Add the mustard and cumin seeds and stir for 30 sec; they should fizz and pop. Add the chopped onion and stir for several minutes. Lower the heat and add the chilli flakes and ground spices and cook for a minute before adding the garlic. Cook a minute more. Remove from heat. When the beans are ready, stir in the tarka and some salt. Simmer for five minutes longer. Stir in some chopped coriander and the juice from a quarter of a lime.