Preheat the oven to 250°. Lightly butter a baking sheet. In a medium-size bowl beat the egg whites until they are stiff but not dry. Gradually add the brown sugar, stirring after each addition.

Place the nuts on a sheet of waxed paper, sprinkle with the flour, and roll until the nuts are coated. Gently fold the nuts into the egg white and sugar mixture. Drop the mixture by teaspoonsful onto the prepared baking sheet. Bake until light brown, about 30 minutes.