2 garlic cloves, crushed1 chili pepper, seeded, finely chopped2 tablespoons of red wine vinegar1 tablespoon of olive oil1 tablespoon of ground paprika1 tablespoon of oregano, finely chopped1 teaspoon of sea salt4 lb chicken, cut into portions 2 lbs of new potatoes, halved or quartered2 red onions, cut into wedges (optional)