Indian Shepherds Pie

Name: Indian Shepherd's Pie
Ingredients: 4 cups leftover mashed potatoes; 1/2 to 1 cup hot water; 1/2 cup milk; 3 tablespoons butter; 2 tablespoons plain yogurt; 2 teaspoons ajwain; Salt; 3 tablespoons grapeseed oil; 1 tablespoon minced garlic; 1 tablespoon minced ginger; 1 onion, chopped; 3 stalks celery, thinly sliced; 1 tablespoon garam masala; 1 tablespoon Italian mixed herbs (dried basil, dried oregano, dried thyme); 1 pound ground beef; 1 cup crushed tomatoes; 2 cups cooked brown lentils; 1 cup grated mozzarella; 2 teaspoons smoked paprika