Core pears from bottom, leaving stem intact. Peel pears. If necessary, cut 1/4 in. from bottom to level. Place in a small baking dish. Brush pears with lemon juice and 1 tablespoon butter. Sprinkle with sugar. Bake, uncovered, at 375° for 25 minutes or until tender, basting occasionally.
In a small saucepan, combine the chocolate, cream and remaining butter. Heat over low heat until smooth, stirring occasionally. Combine caramel topping and macadamia nuts; spoon onto dessert plates. Place pears upright on plates; spoon chocolate sauce over pears.