Boil the eggs for about 10 minutes. Rinse them in cold water, peel and cut them in half. Wash and clean the bell peppers and the cucumber. Cut the bell peppers into thin rings, the cucumber into thin slices. Clean the mushrooms and slice them thinly. Wash, trim and halve the tomatoes. Wash the lettuce and tear it into bite-size pieces. Gently mix the prepared ingredients in a large bowl. Arrange the egg halves on top.