Lentil cottage pie

Keep a large ovenproof dish or 4-6 smaller small ovenproof dishes on hand. 

1 Heat the butter and oil in a saucepan and fry the onions and garlic until soft. Add the sweet potatoes and tomato paste and stir through.

2 Add the Marmite mixture and stock and simmer over medium heat for 15 minutes or until the sweet potatoes are soft.