Rhubarb Strawberry Upside Down Cake - Oryana

Ingredients

• 2 1/2 cups fresh rhubarb, chopped
• 2 cups fresh or frozen/thawed strawberries, sliced
• 1/4 cup butter, melted
• 1/4 cup light brown sugar
• 4 teaspoons whole wheat pastry flour
• pinch sea salt
• 1/4 cup (1/2 stick) butter, melted
• 3/4 cup cane sugar
• 1 egg
• 1 teaspoon apple cider vinegar
• 1 ½ teaspoons vanilla extract
• 1 ½ cups whole wheat pastry flour
• 2 teaspoons baking powder
• 2/3 cup whole milk