French Lentil Shepherd's Pie

A rich base of herbed French lentils, mushrooms, leeks, carrots and peas beneath clouds of extra-cheesy sour cream mashed potatoes.

Serves 4.

Ingredients: Potatoes, milk, sour cream, butter, gruyere, grana padano, lentils, thyme, bay leaf, garlic, leeks, mushrooms, carrots, peas, celery, vegetable broth, tomato paste, flour, lemon juice, salt, pepper