Fresh Green Veggie Salsa

Ingredients

• 1/2 cup finely chopped tomatillos (about 2 medium)
• 1/2 medium cucumber, peeled, seeded, and chopped (about1/2 cup)
• 1/3 cup chopped cilantro leaves
• 1/2 medium celery stalk, finely chopped (about 1/4 cup)
• 3 tablespoons fresh lime juice (about 2)
• 1 green onion, thinly sliced (about 2 tablespoons)
• 1 tablespoon extra-virgin olive oil
• 1/2 teaspoon salt
• 1 ripe avocado, chopped