'lightning') is a pastry made with choux dough filled with a cream and topped with a flavored icing.

The dough, which is the same as that used for profiterole, is typically piped into an oblong shape with a pastry bag and baked until it is crisp and hollow inside.

The icing is sometimes caramel, in which case the dessert may be called a bâton de Jacob[4] (lit.

[10][11] Dunkin' Donuts markets Long John doughnuts as eclairs in the United States.

[12] National Eclair Day is celebrated on June 22 in the U.S.[13] In Brazil, a dessert resembling a miniature éclair is known as a Carolina.