Claire Saffitz's Prune Mascarpone Cake - California Prunes

Ingredients

• 8 ounce pitted California prunes (about 20-25, depending on size)
• 1 ½ cups California Pinot Noir or lighter red wine
• ¼ cup sugar
• Pinch of kosher salt
• 2 cinnamon sticks (or ½ tsp ground cinnamon)
• Optional: 1 star anise pod
• Cooking spray or butter for the pan
• 1 cup all-purpose flour
• ¾ tsp baking powder
• ¾ tsp Diamond Crystal* kosher salt
• 1 large egg (at room temperature)
• 2 large egg yolks (at room temperature)
• 1 cup sugar
• 1 cup mascarpone (divided, at room temperature)
• 4 TBSP unsalted butter (melted and cooled)
• 2 tsp vanilla extract
• 2 tsp finely-grated lemon zest