Gratin of white cabbage & lentils in a Provençal sauce

Name: Gratin of white cabbage & lentils in a Provençal sauce
Cook time: 1 h 20 min
Total time: 1 h 20 min
Cuisine: British
Ingredients: 140g brown or green lentils; ⅓ white cabbage , about 375g/13oz shredded; 25g breadcrumbs; 25g parmesan (or vegetarian alternative), freshly grated; a drizzle of extra-virgin olive oil; 1 red onion , chopped; 2 garlic cloves , chopped; 1 red pepper , seeded and cut into postage stamp-sized squares; 3 tbsp extra-virgin olive oil; 1 tsp ground coriander; 2 generous sprigs thyme; 2x cans chopped tomatoes; 1 tbsp tomato purée; 1 tsp caster sugar; leaves from 1 large sprig basil , roughly torn up