Yucatecan Grilled Catfish with Pickled Red Onions Recipe - Authentic Yucatan Dish

Ingredients

• 1 qt (946 ml) water, plus more as needed
• 2 small red onions, sliced 1 inch thick
• 2 tsp sugar
• 1 tsp dried oregano, preferably Mexican
• 1/2 tsp freshly ground pepper
• 1/2 tsp ground cumin
• 1/2 tsp salt
• 4 garlic cloves, halved
• 2/3 cup cider vinegar or lime juice
• 1 tbsp achiote seed (see note)
• 1 tsp freshly ground black pepper
• 1 tsp ground cinnamon
• 1 tsp ground coriander
• 1/4 tsp ground cloves
• 5 large garlic cloves
• 1 tsp salt
• 3 tbsp cider vinegar or lime juice