Wash & dry radishes. Remove tops & tails. Then cut them into equal sized pieces. Cut extra large radishes into quarters, medium-sized radishes in half, and very small radishes can stay whole. You want them about the same size, so that they'll cook at the same rate.
Put radishes into a mixing bowl and toss with 1 teaspoon of avocado oil (or your preferred high heat oil).
Put oiled radishes into air fryer basket. (You're going to air fry them twice. First without seasonings, and then with seasonings.)Air fry at 400 degrees for 7 minutes.
While the radishes are air frying, grate (or finely mince) garlic into the mixing bowl. Add the remaining 1 teaspoon of avocado oil and a pinch of salt.
Put the radishes into the mixing bowl & fully combine them with the garlic, oil, and salt.
Sprinkle the radishes with 1 Tablespoon of vegan parmesan cheese. Give the bowl a shake to reveal any bare parts of the radishes, and shake on another 1 Tablespoon of vegan parmesan cheese.(Avoid stirring the radishes with the parmesan, because it tends to clump instead of coat.)
Gently pour the radishes back into the air fryer. Sprinkle on a little bit more of vegan parmesan cheese.
Air fry at 400 degrees for 4 to 5 more minutes, until the radishes are golden on the outside & tender on the inside.
Move radishes to a serving dish & finish with chopped green onions for garnish, if you like.
Notes
Vegan parmesan cheese toppingYou can use homemade or store-bought vegan parmesan for this recipe. (If using store-bought, I recommend a grainy style of cheese, which coats better. Avoid the large, flaky variety or any that you grate yourself, like Violife.)However, if you don't have any on hand or don't want to make a full batch, here's what you'll need to make just enough for this recipe.Small batch vegan parmesan
1 Tablespoon hemp hearts
1 Tablespoon raw cashews
1 Tablespoon nutritional yeast flakes
⅛ teaspoon granulated garlic
⅛ teaspoon granulated onion
Pinch of salt
Instructions: Grind all of the parmesan ingredients in a clean coffee grinder or small food processor until it's finely ground. (Because it's such a small batch, I don't recommend using a full-sized food processor for best results.)Standard oven instructionsIf you don't have an air fryer, you can roast radishes in the oven instead. Roast at 425 degrees on a parchment paper lined baking sheet for 20 to 25 minutes. (Make sure the radishes are spread out for best roasting.)For the first 10 minutes, roast the radishes with oil only. Then combine in a bowl with grated garlic, oil, salt, and vegan parmesan, as described in the recipe above. Return to the oven & continue roasting. The radishes are done when they are golden brown & fork tender.Oil-free optionIf you follow an oil-free diet, the oil can be replaced with aquafaba (cooking liquid from a can of beans).Storage & reheatingStore any leftovers in an airtight container in the refrigerator. It will keep for 3 or 4 days. Reheat in the air fryer at 400 degrees for about 5 minutes, or until fully warmed & browned.They won't be quite as crispy after being refrigerated, but still very tasty. If desired, add a few more shakes of vegan parmesan cheese.