Bake a satisfying vegetarian loaf with lentils, chestnut mushrooms and cheese to go with all the classic roast dinner trimmings. Ingredients For the roast 1 tbsp olive oil 15g butter 1 large onion, finely chopped 2 sticks celery, finely chopped 2 garlic cloves, finely chopped 200g chestnut mushrooms, finely chopped 1 red pepper, halved, deseeded and finely diced 1 large carrot, grated 1 tsp dried oregano 1 tsp smoked paprika 100g red lentils 2 tbsp tomato purée 300ml vegetabl