Name: Gail Simmons' Bumbleberry Buttermilk Upside Down Cake
Prep time: 30 min
Cook time: 45 min
Total time: 1 h 15 min
Ingredients: 3/4 cup unsalted butter (6 ounces), cubed, at room temperature, divided; 1 tablespoon fresh lemon juice; 1 1/2 cups granulated sugar, divided; 1 teaspoon kosher salt, divided; 2 cups mixed fresh berries (such as blueberries, raspberries, and blackberries – blackberries halved if large); 4 teaspoons lemon zest, divided; 2 large eggs; 1 1/2 teaspoons vanilla extract; 1 1/3 cups all-purpose flour (about 5 3/4 ounces); 1 1/2 teaspoon baking powder; 1/2 teaspoon baking soda; 1/2 cup whole buttermilk; Powdered sugar, for dusting; Sweetened whipped cream or vanilla ice cream, for serving (optional)