Chop onion, carrots, celery, and mince garlic.

Sauté onion, carrots, and celery in olive oil until softened. Add garlic and cook briefly.

Add broth and water, bring to a boil, then reduce to a simmer.

Stir in pastina and cook until tender. Add greens during last few minutes.

Finish with lemon zest, lemon juice, oregano, salt, and pepper. Serve hot.