It's always good to wash all the fresh ingredients. Even if you purchase triple washed greens in those convenient bags at the supermarket, it's still a good idea to give the greens a rinse.
Remove the ends of the radishes, then thinly them. Peel the shallot and finely mince it. Depending on its size, you want about 3 tablespoons.
Quarter the lemon and remove as many seeds as you can. Slice the chives thinly.