Ratatouille, a stew from the Big Green Egg

Ingredients

• 3 tomatoes
• 1 yellow pepper
• 1 red pepper
• 1 green courgette
• 1 white onion
• 2 cloves of garlic
• 2 sprigs of basil
• 4 tbsp olive oil
• ½ tsp madras curry powder
• ½ tbsp tomato puree
• 2 tbsp tomato ketchup
• 2 tbsp oyster sauce