Rinse the fresh peas under cold water.
Slice the radishes thinly.
Chop the lettuce into bite-sized pieces.
In a large bowl, combine fresh peas, radishes, and lettuce.
Crumble feta cheese over the salad.
Drizzle vinaigrette dressing over the salad.
Gently toss the salad to combine all ingredients.
Season with salt and pepper to taste.
Serve immediately or chill for 30 minutes.