Add kalamata olives, green olives, garlic, herbs, lemon slices, crushed red pepper, and olive oil to the slow cooker.
1 cup kalamata olives, pitted, 1 cup green olives, pitted, 1 lemon, sliced, 1 Tablespoon crushed red pepper, 1 sprig thyme, 1 sprig oregano, 1 sprig rosemary, 3/4 cup olive oil, 6 cloves peeled garlic