Soak the garlic slices in the vinegar or lemon juice for 24 hours. Drain and mix in a large bowl with the olives, parsley, chili flakes, coriander and cumin.
Sterilize a 4 cup wide necked jar by rinsing with boiling water and drying in a warm oven (do not use a dish towel).
Spoon the olive mixture into the jar and pour in the olive oil. Seal and marinate in the refrigerator for 2-3 weeks before serving at room temperature. The olives will keep for a further month in the refrigerator.