Biscuits With Summer Berries And Whipped Cream

Name: Biscuits With Summer Berries And Whipped Cream
Ingredients: 1 cup heavy whipping cream, plus 1 tablespoon for an egg wash; 1/2 cup water, room temperature; 1 cup (2 sticks) unsalted butter, refrigerator cold; 4 cups all-purpose flour; 2 tablespoons baking powder; 1/2 cup white sugar; 1 1/2 teaspoon kosher salt; 2 cups summer berries (any combination of blueberries, stemmed and sliced strawberries/fraises du bois, blackberries, mulberries, raspberries, loganberries, or whatever-is-in-your-neighbor’s-backyard berries); 1 tablespoon white sugar, plus 2 teaspoons for the whipped cream; 1 teaspoon vanilla extract, plus one teaspoon for the whipped cream; 1/16 (pinch) teaspoon kosher salt; 1 teaspoon lemon juice; 1 egg (for the egg wash); 3 tablespoons turbinado sugar (or any coarse sugar), as a topping; 3/4 cups heavy whipping cream (for whipped cream)