Beach Plum Upside-Down Cake - edible Southeastern Massachusetts

Ingredients

• 1 cup sugar
• ½ cup soft butter
• ¼ cup honey (Lyle’s Golden Syrup, or corn syrup)
• ¼ teaspoon salt
• ½ teaspoon vanilla extract
• ¼ teaspoon almond extract
• 2½ cups whole beach plums (pitted)
• ¾ cup plus 2 tablespoons all-purpose flour
• ½ cup plus 1 tablespoon almond flour
• ¼ teaspoon plus ⅛ teaspoon baking soda
• ½ teaspoon plus ⅛ teaspoon salt
• ¾ cups brown sugar (packed)
• ¼ cup plus 1 tablespoon canola oil
• 3 eggs
• ½ cup plus 2 tablespoons buttermilk
• 2 teaspoons vanilla extract