Scrub potatoes. Cook, covered in boiling salted water to cover in a large saucepan, about 35 minutes, or just until tender. Drain; cool slightly; peel.
Place potatoes in a large bowl; mash. Add the butter, bourbon, orange juice, rown sugar, salt and apple-pie spice; beat until fluffy smooth.
Spoon into a buttered, 6-cup baking dish; sprinkle nuts around the edge.
Bake in moderate oven at 350° for 45 minutes, or until lightly brown.