Healthy Cauliflower Shepherd Pie

Name: Healthy Cauliflower Shepherd Pie
Ingredients: * 1 large head of cauliflower; * 1/2 cup chicken vegetable stock; * 1 clove of garlic; * salt and pepper to taste; * 2 tbsp butter; * 1/2 cup grated parmesan; for the filling; * 1/2 pound button cremini mushroom, chopped; * 2 pound ground lamb or beef; * 1 fresh bay leaf; * 2 tbsp rosemary, finely chopped; * 1 onion, chopped; * 2 rib celery, chopped; * 4 clove garlic, chopped; * 1 tsp smoked paprika; * 2 tbsp tomato paste; * 2/3 cup stock (beef vegetable chicken); topping; * 1/2 cup shredded cheddar cheese