3 cups mixed berries (raspberries, blueberries, blackberries, and strawberries; strawberries stemmed and halved
lengthwise if small, quartered if large), room temperature (see note)
2 teaspoons granulated sugar
Pinch table salt
3 large egg yolks
3 tablespoons granulated sugar
1 teaspoon lemon zest, finely grated
1 tablespoon fresh lemon juice
2 tablespoons Marsala
2 teaspoons light brown sugar
3 tablespoons heavy cream, chilled
1. FOR THE BERRY MIXTURE: Toss berries, sugar, and salt together in medium nonreactive bowl. Divide berry mixture evenly among 4 shallow 6-ounce gratin dishes set on rimmed baking sheet. Set berries aside to release juices while preparing zabaglione.
2. FOR THE ZABAGLIONE: Whisk egg yolks, 2 tablespoons plus 1 teaspoon granulated sugar, marsala, lemon juice, and zest in medium glass bowl until sugar is dissolved, about 1 minute. Set bowl over saucepan of barely simmering water (water should not touch bottom of bowl) and cook, whisking constantly, until mixture is frothy. Continue to cook, whisking constantly, until mixture is slightly thickened, creamy, and glossy, 5 to 10 minutes (mixture will resemble hollandaise and form loose mounds when dripped from whisk). Remove bowl from saucepan and whisk constantly for 30 seconds to cool slightly. Transfer bowl to refrigerator and chill until egg mixture is completely cool, about 10 minutes.
3. Meanwhile, adjust oven rack 6 to 7 inches from heating element and heat broiler. Combine light brown sugar and remaining 2 teaspoons granulated sugar in small bowl.
4. In large bowl, whisk heavy cream until it holds soft peaks, 30 to 90 seconds. Using rubber spatula, gently fold whipped cream into cooled egg mixture. Spoon zabaglione over berries and sprinkle sugar mixture evenly over zabaglione; let stand at room temperature for 10 minutes, until sugar dissolves into zabaglione.
5. Broil until sugar is bubbly and caramelized, 1 to 4 minutes. Serve immediately.