California Greek salad - chinese grandma

Ingredients

• 1 large English cucumber (aka seedless or hothouse – the shrink-wrapped kind)
• 1 bell pepper (red/orange/yellow are sweeter than green)
• 1/2 small onion (optional)
• 1 pint grape tomatoes
• 1/4 cup kalamata olives
• 1/2 teaspoon dried oregano
• 1/2 teaspoon kosher salt (start with 1/4 teaspoon if using table salt)
• 1/4 teaspoon black pepper
• 1/2 lemon OR 2 tablespoons red wine vinegar
• 3-4 tablespoons extra virgin olive oil
• 1/4-1/2 cup crumbled feta
• 2 ripe Haas avocados (avocados should give slightly when gently squeezed)