Mash two avocados (for two sandwiches) and mix in some reduced balsamic vinegar and salt. Slice 2 thick pieces (each) of crusty white bread. Top one slice with mashed avo and roasted tomatoes (from deli or homemade). Top the other slice with thin slices of nutty white cheese (eg Piave). Toast well. Add some bitter leafy lettuce and fresh dill, top avo slice with cheese slice, and gobble.