Zummer Zingy Zalza takes roughly 20 minutes to make. You will need 2 large tomatoes, 1 white or yellow onion, 2 cloves of garlic, juice from 2 limes, salt and pepper, and 1/4 cup fresh cilantro. Quarter the tomatoes and onion, together with garlic, place them in the oven to roast until the surface has dried and started to brown (200 Celsius oven for 15 to 20 minutes). If garlic started to brown halfway, remove garlic from oven. Place the vegetables and cilantro in a food processor, pulse until coarsely pureed. Mix in lime juice, and season with salt and pepper to taste.