Spanish Egg-salad Party Sandwiches

Grate eggs into a medium bowl. Stir in paprika, mayo and salt. Season with pepper. Cut crusts from bread, then, using a rolling pin, flatten each slice of bread. Spread each with a little butter on 1 side. Divide egg salad equally among bread slices, and smooth with a knife. Lay 4 or 5 olives at the short end of each sandwich, and roll into a short log. Wrap tightly with plastic wrap. Refrigerate at least 1 hour, but best overnight, before slicing and serving.