Preheat oven to 400°F.
Stir rhubarb, strawberries, sugar and first amount of flour together.
Transfer to 8x8 baking dish.
Bring brown sugar and water to a boil and set aside to cool.
Meanwhile, stir flour, baking powder, cinnamon and salt together.
Cut in shortening until it resembles coarse oatmeal.
Add milk and stir just to combine.
Drop by spoon on top of fruit, then spread with fingers to mostly cover.
Pour brown sugar syrup over top.
You may want to place on parchment lined baking sheet, just in case it bubbles over.
Bake at 400°F for 30 minutes.
Allow to cool.
Serve with ice cream or a slice of cheddar cheese.