Collard Greens with Ham and Smoked Hock

INGREDIENTS

• 2 tablespoons olive oil
• 1 large onion, diced
• 4 cloves garlic, minced
• 2 tomatoes, chopped
• 2 smoked ham hocks
• 1 1/2 cups chopped smoked ham
• 5 cups water
• 1 tablespoon apple cider vinegar
• 2 bunches of collards (about 2 pounds) or two 16oz bags chopped collards
• salt and freshly ground pepper to taste