1 1/2 cups unbleached all-purpose flour
1 1/4 cups almond flour
1 cup Sugar
2 1/4 teaspoons baking powder
3/4 teaspoon salt
12 tablespoons unsalted butter (at room temperature, cut into 12 pieces, 1-1/2 sticks)
3 large eggs (at room temperature)
2/3 cup buttermilk
1 teaspoon pure vanilla extract
  grated zest of 1 lemon
6 ripe plums or pluots (pitted and cut into quarters)
2 tablespoons honey or agave syrup
1/4 cup sliced almonds
2/3 cup heavy (whipping) cream
1/3 cup yogurt (preferably Greek style)
1/3 cup honey