Wash the rosemary, dab dry and, except for something to garnish, pluck the needles from the stems. Chop the needles finely. Grate the parmesan and mix with the almonds, rosemary and egg yolk to a paste.
Spread 1 teaspoon of the paste on each of the pumpernickel, press it flat a little and place it on a baking tray. Grill under the hot grill of the oven for 2-3 minutes until golden brown. Remove the thalers, arrange on a plate and garnish with the remaining rosemary.