Pre heat the oven to 180 degrees C

Place the red lentils in a saucepan and cover with boiling water

Bring back to the boil and simmer gently, for 10-15 minutes until soft, adding more water if necessary

Stir occasionally to prevent the lentils sticking to the bottom of the pan

Meanwhile, heat the olive oil in a large frying pan

Cook the onion until soft

Add the garlic and courgette

Continue cooking for a few minutes and then lower the heat

Add in the cooked red lentils

Sprinkle in the dried mixed herbs

Add the oats

Stir in the egg and 3/4 of the cheese

When all is thoroughly mixed in place in a baking dish

Sprinkle on the remaining cheese

Slice the tomato and place on top, if using

Bake in the oven for about 30 minutes