Rinse lettuce and cut into bite size pieces. (You can tear them if you really want to.)
Dust off mushrooms, remove stems, and slice into thick pieces, about 1/4".
Peel the cucumber and slice it into 1/4" thick circles.
Slice the tomatoes into 1/2" wedges.
Wash radishes, remove leafy head and root, and slice into 1/8" circles.
Mix all ingredients together in a large salad bowl and add your favorite balsamic vinaigrette dressing.