Goat Cheese Cake with Mixed Berries

INGREDIENTS

• Unsalted butter (for pan)
• 3/4 sugar plus more for pan
• 12 fresh soft goat cheese, room temperature
• 1 finely grated lemon zest
• 1 fresh lemon juice
• 1 vanilla extract
• 6 large eggs, separated
• 3 all-purpose flour
• 1 1/2 mixed berries (blackberries, strawberries, blueberries, and/or raspberries)
• A 9-inch-diameter springform pan