• 1 pound rhubarb stalks (diced)
• 2 large apples
• 3 tablespoons orange juice
• 1 cup sugar (granulated)
• 1/2 teaspoon cinnamon (ground)
• 1 tablespoon all-purpose flour
• 1 tablespoon butter (cut into small pieces)

Topping:

• 1 cup all-purpose flour
• 1/2 cup brown sugar (packed, light or dark)
• 3/4 cup quick-cooking oats
• 1/4 teaspoon baking soda
• 1/8 teaspoon salt
• 6 tablespoons butter (melted)