3/4 cup canned solid-pack pumpkin
Position rack in center of oven and preheat to 325°F. Stir 2/3 cup sugar and 1/4 cup water in heavy small saucepan over medium heat until sugar dissolves. Boil until mixture turns amber-colored, brushing any crystals that form on sides of pan with wet brush and swirling pan occasionally, about 7 minutes. Immediately divide caramel among six 1/2-cup soufflè dishes to cover bottoms and sides with caramel. Cool.
Whisk pumpkin, eggs, sugar, vanilla, cinnamon and allspice in large bowl to blend. Gradually whisk in milk. Divide mixture among soufflè dishes. Place dishes in large baking pan. Add enough water to baking pan to come halfway up sides of dishes. Bake until flan is set, about 55 minutes. Cool. Refrigerate at least 8 hours and up to 2 days. Run small sharp knife around edges of dishes to loosen. Turn flans out onto plates and serve.