How to Make It
Grate radishes, cucumbers, and carrots using the coarse grater disk on a food processor (or the largest holes on a box grater). Transfer grated vegetables to a colander set over a medium-size bowl, and toss with 1/2 teaspoon of the salt. Refrigerate 1 hour. Discard drained liquid in bowl, blot vegetables dry with paper towels, and place in bowl.
Stir sliced sugar snap peas into vegetables in bowl. Add sour cream, dill, sugar, garlic, pepper, and remaining 1/4 teaspoon salt, and stir to combine. Serve immediately.