Butterdejs-Tarteletskaller

Tarteletter belong to the Danish dinner party. Not the casual weeknight kind, the kind where the table is set the day before, candles are lit before anyone sits down, and someone in the kitchen has been folding pastry since morning. They are the dish that begins the meal at confirmations, christenings, and the long Sunday lunches that mark the Danish year. By the time the asparagus comes up in May, every Danish home cook starts thinking about tarteletter again.

The filling is the cook's choice. Hons i asparges, chicken in asparagus cream, is the classic, but I've eaten them filled with shrimp in dill cream, smoked salmon, mushrooms in sherry, asparagus alone when the season is at its peak. The shells are the architecture. They are what holds everything else up, and they are what we're making here.

Butterdejs is puff pastry, and there's no shortcut worth taking. You make a base dough, you encase a block of cold butter, you roll and fold and chill and roll and fold and chill again until the dough holds hundreds of paper-thin layers of butter and flour, alternating like the pages of a book. When the heat hits them in the oven, the water in the butter turns to steam, the layers separate, and the shell rises tall and hollow. That's it. That's the whole trick. The joy of waiting is built into every step, because every fold needs the rest that follows it.

Pay attention to one thing above all else: temperature. The butter and the dough must stay cold and equal in firmness through every fold. Warm butter tears and disappears into the flour, and your shells will rise crooked or not at all. Cold butter, cold dough, cold counter, cold patience. You'll know it's right when you cut one open and see the layers stacked like the rings of a tree.