Bulb (yes, bulb) of garlic, minced
    2 tsp salt
    1 tsp ground black pepper
    1/2 cup orange juice
    1/2 cup lime juice
    1/2 cup lemon juice
    Zest from the citrus
    2 tsp cumin

Mix it all up and cover your meat completely. Due to the high acid content, don’t marinate for longer than an hour.