It's deep-fried like a doughnut but filled like a French pastry, coated in crunchy sugar right after frying so the sugar never has time to melt.
A xuixo is a cylinder of yeasted dough deep-fried until golden, then rolled in granulated sugar and filled with thick vanilla custard. Bakeries around Girona sell them warm, often first thing in the morning.
Churros con Chocolate
Empanada Gallega
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Cava