Mama's Oh-So-Savory Lamb and Eggplant Casserole

Ingredients

• 1 pound eggplant (, cut into 1-inch cubes)
• Salt (as needed)
• 1 tablespoon olive oil
• 1 large sweet onion (, coarsely chopped)
• 2 large stalks celery (, sliced)
• ½ teaspoon ground cumin
• 2 pinches dried oregano
• 2 pinches ground dried rosemary
• 2 pinches paprika
• ⅛ teaspoon dried mint
• Salt
• ground black pepper
• 1 ½ teaspoons minced garlic
• 3 tomatoes (, coarsely chopped)
• 1 cup chicken broth
• 1 (15 ounce) can tomato sauce
• 1 pound ground lamb
• Juice of 1 lemon (or to taste)