Mash the tuna with a fork.
Cut the olives into slices and add to the tuna and corn.
Add your favorite spices.
Add mayonnaise and mix everything well.
Toast the bread on both sides until slightly golden brown.
Assemble the sandwich: Place the filling on one slice of bread.
Place lettuce leaves on the other and cover the filling.
You can sprinkle sesame seeds and dill on top and serve with hot, delicious coffee.