Only two US states have an official state donut: Massachusetts with the Boston cream and Louisiana with the beignet. The French word means bump, and it traces to a Celtic root with the same meaning, shared with the Spanish buñuelo from the Middle Ages. This episode splits the beignet into two very different pastries. The French version uses choux paste, with no yeast or baking powder, and puffs up when trapped water flashes to steam in 350 degree oil, leaving a hollow shell. The Louisiana version relies on yeast, bread flour, and a gluten network that traps carbon dioxide for a dense, chewy pillow.

The beignet reached New Orleans in the 1700s with French colonists and the Acadians, who were driven out of Nova Scotia and New Brunswick by the British in 1755 during Le Grand Dérangement and later became the Cajuns. In the swamps of Louisiana, frying was faster and more practical than building masonry ovens, and resilient yeast dough replaced delicate choux. In Senegal the idea adapted again, using drought tolerant millet flour that has no gluten and fries into a dense, crunchy ball related to West African puff puff.

• Cooking flour with butter and water gelatinizes the starch, creating the elastic trap that steam inflates in choux beignets.
• Yeast eats sugars and exhales carbon dioxide, which the glutenin and gliadin web in bread flour holds in tiny pockets.
• Many cultures fried dough independently, from Native American fry bread to Asian fried breads; the French codified and branded it.
• Frying at high heat seals a crust through the Maillard reaction and sterilizes food, a big advantage before refrigeration.
• Savory beignets stuffed with meat and cheese use the fried shell as a protective casing for protein.