Cut the chayote in half lengthwise and steam until just tender, about 35 minutes. Do not overcook. You don't want the shells to collapse when you scoop them out. Meanwhile, combine the almonds and sugar in a food processor and grind until the almonds are fairly fine.
Preheat the oven to 375°F. When the chayote is cool enough to handle, remove the seed, and scoop out the pulp, leaving a one-half-inch-thick shell. Set aside. Place the chayote pulp in the processor with the ground almonds; add the eggs and process to a puree. Add the brandy, vanilla and milk or cream. Blend. Pour the mixture into a bowl and stir in nutmeg, cake crumbs and raisins. Spoon the pudding mixture into the chayote shells (you will have about one and one-half cups left over) and place them in a greased baking dish. Sprinkle with the slivered almonds and the reserved cake crumbs over the tops. Bake for 30 minutes. Pour the remaining pudding mixture into a greased loaf pan and bake for 25 minutes. Serve warm, topped with whipped cream.
(The pudding loaf serves 4.) PER SERVING: 420 calories, 10 g protein, 54 g carbohydrate, 20 g fat (7 g saturated), 192 mg cholesterol, 141 mg sodium, 3 g fiber. From an article by Jacquiline Higuera McMahan in the San Francisco Chronicle, 6/2/93.