Guacamole

I made this for a Super Bowl party a few weeks ago, and people loved it. I had never made guacamole before, but this recipe was awesome. I did substitute some asian chili sauce for the serrano chiles because that is what I had on hand, but it served the same purpose. I also omitted the tomatoes.

2 ripe avocados
1/2 red onion, minced
1-2 serrano chiles, stems and seeds removed, minced
2 T cilantro
1 T lemon or lime juice (I used fresh limes, which was wonderful)
1/2 tsp coarse salt
black pepper
1/2 tomato, chopped

Mash avocado in bowl. Add onion, cilantro, lime juice, salt, and pepper. Mash more. Add chili pepper to taste. Add tomatoes just before serving.