Very good recipe. I did a combination of rhubarb, strawberries, and blackberries. I used whole wheat flour in the crumble. I also added a couple of tablespoons of ground flax to the crumble. Turned out great!
This is my go-to crumble recipe. I've made it with blueberry-rhubarb, blueberry-raspberry, and plain blueberry, as well as the original recipe, and it's always delicious!