Nut Kolachky Filling

Nut kolachky filling is the traditional Eastern European walnut filling that goes inside kolachky cookies, sweet rolls, and folded yeast pastries. The whole filling is five ingredients mixed in one bowl, no cooking, no chilling, ready in minutes.

The filling holds together because of the protein in the egg whites, which bind the ground walnuts and sugar into a thick spreadable paste. A whole egg gets added to the mix as well, the yolk enriches the filling without making it too loose.

Melted butter is the binder that brings it all together and adds richness. Use butter, not margarine, the flavor difference is noticeable in a filling this simple.

Grind the walnuts fresh in a food processor for the best flavor, pre-ground nuts oxidize quickly and lose their sweet aromatic edge. Pulse rather than process continuously, you want a fine crumb texture not nut butter.

This filling makes enough for about two dozen cookies or a single large yeast roll. It can be made a day ahead and refrigerated, just bring to room temperature before spreading.

Kitchen Tips

• Toast the walnuts in a dry skillet for 5 minutes before grinding for a deeper, sweeter flavor.
• Mix gently to avoid breaking down the nuts into a paste, you want texture in every bite.
• Add a teaspoon of vanilla extract or a splash of dark rum for an extra flavor layer.
• If the filling is too dry, add another splash of melted butter, too wet, add a tablespoon of breadcrumbs.

Variations

• Add a teaspoon of cinnamon and a pinch of nutmeg for a more spiced filling.
• Substitute toasted pecans or hazelnuts for half the walnuts for a different nutty profile.
• Stir in a tablespoon of golden raisins or chopped dried apricots for a fruity contrast.