Cucumber Salsa Salad

Name: Cucumber Salsa Salad
Ingredients: 1 long European cucumber, very finely diced; Salt to taste; 1 small red onion, finely minced; 5 medium-size ripe tomatoes, finely chopped; 2 jalapeño or serrano peppers, seeded if desired and finely chopped; 1/4 to 1/2 cup chopped cilantro (to taste), plus several sprigs for garnish; 1 teaspoon balsamic vinegar; 3 tablespoons fresh lime juice; 3 tablespoons extra virgin olive oil; Leaf lettuce or Boston lettuce for serving (optional); 1 avocado, sliced, for garnish