Better-than-baked beans with spicy wedges

INGREDIENTS

• 1 tsp oil
• 1 onion , halved and thinly sliced
• 2 rashers streaky bacon , cut into large-ish pieces
• 1 tsp sugar , brown if you have it
• 400g can chopped tomatoes
• 200ml stock from a cube
• 410g can cannellini beans , butter or haricot beans in water
• 1 tbsp white flour (plain or self-raising)
• 0.5 tsp cayenne pepper , paprika or mild chilli powder
• 1 tsp dried mixed herb (optional)
• 2 baking potatoes , each cut into 8 wedges
• 2 tsp oil