Olive Oil Ricotta Cake with Plums

INGREDIENTS

• 1 1/2 cup all-purpose flour
• 1 tablespoon sugar or honey
• 9-10 small plums, halved, pitted, and set aside
• 1/3 cup olive oil
• 1 cup granulated sugar
• 1 1/2 teaspoon baking powder
• 1 tablespoon freshly grated lemon zest
• 1/2 teaspoon salt
• 1/4 teaspoon baking soda
• 2 large eggs
• Butter for pan
• 1 cup fresh, full-fat ricotta
• Confectioner's sugar, for dusting