Gluten-free chickpea base veggie pizza

Ingredients

• 250ml water
• 200g chickpea flour
• ½ tsp fennel seeds
• ¼ tsp salt
• ¼ tsp onion powder
• Pinch garlic powder
• Pinch of black pepper
• 200g tomato sauce
• 1 tbsp olive oil
• 1 marrow
• 1 small aubergine
• 1 yellow bell pepper
• 1 red bell pepper
• 1 tbsp capers