Notes: Foie gras is easiest to handle when cold and firm. Make sauce (step 3) up to a day ahead; cover and chill, then reheat. As a less costly alternative to fresh foie gras, buy 1/2 pound duck or chicken liver pâté or mousse. Cut pâté into 6 equal parts and spread on toast, then broil about 6 inches from heat just until pâté begins to sizzle, about 2 minutes. Top with sauce.
6 to 8 ounces chilled fresh duck foie gras
2 firm-ripe Fuyu persimmons (5 to 6 oz. total), rinsed
About 2 cups watercress sprigs, rinsed and drained
6 slices (about 1/2 in. thick; 6 oz. total) dense white bread or slightly sweet egg bread such as brioche or challah
How to Make It
Rinse foie gras, pat dry, and discard any tough membrane. Cut foie gras crosswise into 1/2-inch-thick slices. Cover and chill.
Trim off stems and bottom ends of persimmons. Cut each crosswise into 3 equal pieces. Lay a slice on each plate with a cluster of watercress sprigs.
In a 10- to 12-inch frying pan, mix demi-glace, madeira, vinegar, and cream. Boil over high heat, stirring often, until 2/3 cup, about 5 minutes. Put sauce in a small bowl; keep warm. Rinse and dry pan.
Lay bread slices, side by side, in a 10- by 15-inch pan. Broil about 6 inches from heat until toasted on both sides, about 3 minutes total. Keep toast warm.
Place frying pan over high heat; when very hot, add foie gras. Brown slices lightly, turning once, about 1 minute total (fat spatters, so partially cover pan). Take off heat.
Put toast on plates and top each slice with about 2 teaspoons of foie gras fat. Top equally with foie gras.
Drizzle warm sauce equally over foie gras. Season to taste with salt.
Nutritional analysis not including foie gras, which is approximately 98% fat.