Ingredients
1/3  cup finely chopped onion
2  medium ripe avocados, pitted and peeled
1  medium tomato or plum tomato, diced
2  tablespoons fresh lime juice
1  tablespoon chopped fresh cilantro
1-1/2  teaspoons seeded and minced serrano chile
1  teaspoon finely chopped garlic
1/2 to 3/4  teaspoon salt
1/4  teaspoon Mexican oregano, crushed
 

Directions
1. Rinse onion in a sieve under hot water for 1 minute; drain and pat dry on paper towels. 
2. Coarsely mash avocados with a fork in a medium bowl. Stir in onion and remaining ingredients. Makes 8 servings (2 cups). 

Source:  Ladies Home Journal