Thinly slice the red onion and garlic. Cut the mushrooms into thick slices or chunks. Cut the red pepper into bite-sized chunks
Heat the oil in a frying pan, then sauté the onion for 5 minutes. Stir in the garlic and oregano, then add mushroom and red pepper chunks. Add the chipotle paste and stir to coat well, then add the chopped tomatoes. Add a drop of water and a squeeze of lime juice.
Put a lid on, turn down the heat and cook for 10 minutes or until the vegetables are tender.
Season to taste.
Serve with chopped coriander leaves and lime wedges on the side.