YOU WILL NEED
1/4 cup finely minced onion
3 ripe Haas avocados
1 1/2 tablespoons fresh lime juice (or lemon juice)
1 large Plum or Roma tomato, deseeded and diced
1/4 cup cilantro leaves and tender stems, chopped
1/2 teaspoon ground cumin, optional
1/2 teaspoon salt, or more to taste
1 to 2 teaspoons minced jalapeño or serrano pepper, with seeds and membrane removed, optional
