Fry the mince with a little oil. Chop the onion and fry with it. Deglaze with Tomato Gusto and let simmer a little more. Then pour into a baking dish.
Chop the zucchini and spread on top of the tomato and mince sauce. Chop or crumble the feta, mix with the mug of creme légère and spread on the casserole.