In a small bowl, whisk together the fresh lemon juice, salt, sumac, crushed garlic clove and cayenne pepper.
½ small Lemon, ½ teaspoon Salt, 1 teaspoon Sumac, 1 small Garlic clove, ⅛ teaspoon Cayenne pepper
In a salad bowl, add the chopped radish greens and thinly sliced onions. Drizzle the salad dressing onto the radish greens and onion and gently toss to combine. Adjust seasoning if needed and serve.