Strawberry Rhubarb Upside Down Cake

Ingredients
 2½ cups fresh rhubarb
2 cups fresh strawberries
¼ cup butter, melted
½ cup brown sugar
1½ tablespoons flour
Batter
¼ cup butter, melted
¾ cup sugar
1 egg
1½ cups flour
2 teaspoons baking powder
1 lemon, zested & juiced
⅔ cup milk

Instructions
Preheat oven to 350 degrees.
Toss rhubarb, strawberries & flour in a small bowl. Pour ¼ cup melted butter into a 9" round pan. Top with brown sugar and strawberry/rhubarb mixture.
For the batter, combine melted butter & sugar. Stir in egg & 1 tablespoon lemon juice.
In a small bowl, combine flour, baking powder, lemon zest & a pinch of salt.
Add flour mixture alternately with the milk to the butter mixture. Stir just until combined.

Notes
Source recipes -Here-