Keto Slow Cooker Beef Stew

Name: Keto Slow Cooker Beef Stew
Cuisine: European
Ingredients: 3 - 3 1/2 pounds grass-fed beef, diced; 1 1/2 cups beef bone broth (try this recipe); 3 stalks of celery, chopped; 3 carrots, chopped into large rounds; 1 tablespoon chopped ginger; 3 garlic cloves, minced (optional); 1 leek, white part only with the hard outer layer removed; One 15-ounce can diced tomatoes (BPA-free); 3 handfuls fresh spinach; 2 tablespoons apple cider vinegar; 2 teaspoons dried rosemary, or 1 sprig (leaves only); 2 teaspoons dried thyme or 2 sprigs (leaves only); 2 teaspoons dried oregano; 1 tablespoon Grass-Fed Ghee or coconut oil; Salt and pepper to taste