Brush madeleine pan with butter and dust with flour.

Melt butter; set aside.

In a large bowl, combine eggs, honey, sugar, orange zest and allspice. Set over saucepan of simmering water and whisk until lukewarm. Remove bowl and with electric mixer on high speed beat until pale yellow and tripled in volume. Add vanilla; reduce speed to low and gradually mix in flour.

Transfer 1/3 batter to another bowl and gradually fold in melted butter. Return butter mixture to original bowl; fold in gently.

Spoon into molds almost to the top. Bake in a preheated 400 oven until golden, about 12 minutes.

Remove cookies from pan and cool on a wire rack. Sprinkle with confectioner's sugar.