oil for frying
1 large onion, chopped
1 red chilli, finely chopped
2 garlic cloves, finely chopped
1 tsp mild chilli powder
410g tin black-eyed beans, drained and rinsed
410g tin red kidney beans, drained and rinsed
2 x 400g tins chopped tomatoes
12 taco shells
a small handful coriander, roughly chopped
1 lime, cut into wedges
soured cream for serving (optional)