Heat water, brown sugar, chocolate, cloves, and cinnamon to boiling in 3-quart saucepan; reduce heat. Simmer, uncovered, for 15 minutes. Stir in coffee. Remove from heat; cover and let stand 5 minutes. Stir in vanilla. Strain coffee through 4 thicknesses of cheesecloth.
CAFE DIABLO: Cafe Mexicano Prepare Cafe Mexicano; keep hot in saucepan after straining. Heat brandy just until warm in small, long-handled saucepan. Remove from heat; ignite. Pour flaming brandy over coffee. Allow flame to burn out; stir. Pour coffee into cups or mugs. Top each with whipped cream and 1 T liqueur. Garnish with cinnamon stick, if desired.