Soak 125g dry weight haricot beans for 5 hrs or overnight. Drain.

Boil vigorously for 10 mins, drain, then put in slo-cooker with 150 ml water, 3 tablespoons tomato puree, 1 tablespoon vinegar, 1 tablespoon sugar (or honey ceridwen!) a scant quarter teaspoon chilli, 2 bay leaves if you have them. You can add thyme leaves if you have them.

Cook 4 hrs on high, or all day on low.

Serve with mash and sausages. A 23p evening meal!