Directions:
Preheat the oven to 350 degrees F (180 degrees C). Coat six 8-ounce (240 mL) souffle cups with nonstick spray. Add 1 teaspoon (5 mL) of the sugar to each cup and swirl to coat the bottom and sides. Distribute 3/4 cup (180 mL) of the blackberries and 3/4 cup (180 mL) of the raspberries among the cups.
Grate 1/2 teaspoon (2.5 mL) of rind from the lemon into a medium saucepan. Add the remaining 1 cup (240 mL) of blackberries, 1 cup (240 mL) of raspberries, and 4 tablespoons (60 mL) of sugar. Bring to a boil over medium heat. Cook and mash the berries for 3 to 5 minutes, or until the berries are very soft. Transfer the mixture to a fine sieve set over a small saucepan. With the back of a spoon, press the berries through the sieve to extract the pulp; discard the seeds.
Cut the lemon in half and squeeze 2 tablespoons of juice into a small bowl. Add the cornstarch and stir until dissolved. Stir into the berry puree and bring to a boil over medium-high heat, stirring constantly. Cook, stirring, for 30 seconds, or until thickened. Remove from the heat and stir in the liqueur (if using). Transfer to a large bowl and let cool to room temperature.
In a medium bowl, combine the egg whites, cream of tartar and salt. Using an electric mixer, beat on medium speed until foamy. Beat on high until the whites are firm and glossy.
Fold the egg-white mixture into the berry puree. Spoon the mixture into the soufflé cups and smooth the tops.
Place the cups in a roasting pan and add about 1 inch (2.5 cm) of water to the pan. Bake for 25 to 30 minutes, or until the soufflés are firm when jiggled and the tops are golden brown and puffed. Dust with confectioners' sugar.
Nutrition Information (per serving):
Calories: 111
Total Fat: 0 g
Protein: 3 g
Carbohydrates: 25 g
Fiber: 5 g
Cholesterol: 0 mg
Sodium: 37 mg
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