Ratatouille Sub

Ingredients 1 zuccini 1 Egg plant 1 yellow squash 1 to 2 red peppers 1/2 small yellow onion 8 oz tomato puree or tinned tomato sauce 1 garlic clove, finely chopped 2 tbsp olive oil salt chilli flakes or piment d’Espelette 1 tbsp chopped fresh herbs, such as thyme sub rolls, or the equivalent length [...]