Cool Mexican bean wraps

INGREDIENTS

• vegetable oil or olive oil
• 1 onion, peeled and sliced
• 1 clove garlic, peeled and crushed
• 1 pinch chilli powder
• 1 teaspoon tomato puree
• 400 g tinned red kidney beans, drained and washed
• 400 g tinned tomatoes
• salt
• freshly ground black pepper
• ½ green pepper, sliced
• ½ red pepper, sliced
• 4 large flour tortillas
• 60 g cheese, grated