Green Tomatoes in Gratin

Fry the onions in olive oil until they wilt, then spread to line bottom of oven proof dish.

Slice the tomatoes thickly and place over onions.

Mix the stock with remaining oil and seasoning and pour over vegetables.

Cover dish with foil and bake in slow oven until tomatoes are tender.

Mash the vegetables, adjust seasoning, stir in the grated cheese, Place under grill to brown top.