Serves 12 to 14. Note: For additional flavor, toast the nuts (spread in a single layer on a baking sheet and bake 5 to 10 minutes at 350 degrees, shaking pan once or twice during baking, until they begin to give off an aroma). Dutch-processed cocoa is a richer, darker cocoa, treated with alkali to neutralize cocoa's natural acidity. Adapted from Cook's Country magazine. Glaze adapted from "Baking" by Dorie Greenspan (Houghton Mifflin, $40).
• 2 oz. bittersweet chocolate, chopped
• 1/2 c. boiling water
• 3/4 c. Dutch-processed cocoa powder, plus extra for pan
• 2 c. flour
• 2 c. walnuts or pecans, finely chopped
• 2 c. powdered sugar
• 1 tsp. salt