Lemon Chicken Tacos

Ingredients

• 1 lb boneless skinless chicken breast, cut into 1/2 inch cubes
• 2 tablespoons lemon juice, divided
• 1 teaspoon lemon juice, divided
• 1 large onion, sliced
• 1 green onion, sliced
• 2 garlic cloves, minced
• 2 teaspoons olive oil
• 1/2 teaspoon ground cumin
• 1/2 teaspoon salt
• 1/4 teaspoon pepper
• 2 plum tomatoes, seeded and chopped
• 1/4 cup fresh cilantro, minced
• 6 (8 inch) flour tortillas, warmed
• 1 cup lettuce, shredded
• 1/2 cup salsa
• 1/2 cup cheddar cheese, shredded (optional)
• 1/2 cup sour cream (optional)