Preheat oven to 450 degrees. Cut the greens off the radishes and set aside. Remove any roots from the radish and discard. If the radishes are large, cut them in half. Coat the radishes with 1 tablespoon cooking fat, place on a baking tray, and cook for 15 minutes, turning halfway through.
While the radishes are baking, juice half a lemon, set aside, and rough chop the radish greens.
Once the radishes are baked, add the greens to the hot pan with the radishes. The heat from the radishes will cook the greens and save you from having to cook them separately!
Drizzle everything with the lemon juice, and ½ teaspoon of salt and pepper.
Add the radishes and greens to the food processor (or finely chop). Taste vegetable mixture and add more salt if desired. Let the mixture cool completely.
In a large bowl, add the ground meat and remaining ½ teaspoon of salt. Gradually incorporate vegetable mixture into the ground meat. Add as much as you can while still being able to form your burgers as normal. If you end up adding too much vegetable mixture, don’t worry! Just form your burger and cook in the oven for 20 minutes at 350 degrees.
Cook burgers on medium heat on the stove for 5 minutes each side or to your preference. Cooking times can vary.
Optional: Serve with your favorite cheese and condiments.