This recipe is a guideline. You can add more peppers, more citrus, more cilantro to best suit your palate. We are recommending a sweet onion to contrast with the acidity of the tomato and the heat of the peppers. Zach uses two types of peppers that have different levels of heat and flavor profiles. This adds some complexity to your pico.
Keyword class recipe, Onions, Peppers, Tomatoes