Flourless Warm Lemon Pudding Cake

granulated sugar

unsalted butter, soft

large eggs, separated

heaping Tbsp lemon zest (from 2 lemons)

almond meal (almond flour.) You can use regular all purpose flour as well.

salt

cultured buttermilk (shake before measuring)

fresh squeezed lemon juice

cream of tartar (this helps stabilize the egg whites)

garnish

powdered sugar

berries (optional)