Combine the eggs and sugar in a heavy saucepan and whisk constantly over low heat until the mixture is lukewarm and light in texture, about 3 to 5 minutes.
Remove from heat and whisk until cool; gradually stir in the flour until the batter is smooth.
Preheat oven to 375F (190C).
Butter 2 baking sheets and drop the batter by teaspoonfuls onto the pan, leaving about 1 inch between cookies.
Let sit 5 minutes.
Place 4 or 5 pine nuts on top of each cookie and let them sit another 5 minutes.
Bake for 12 to 15 minutes or until golden brown.
Remove from the baking sheets while still warm and let cool on racks.