Green Garlic Aioli

If you have an egg yolk, oil, and a splash of something acidic (lemon or vinegar), you can make mayonnaise. But while you’re undergoing this effort at home, why just make plain old mayo?  Adding garlic and good olive oil, you can make aioli–and if it’s spring or early summer, why not add green garlic, the mild, sweet, early-stage allium that can be found this season?