Hurry Tuna, Please

From what I can gather from Google, this is a pretty well-known recipe in the US.

Serves 4

2 tbsp olive oil
1 apple, chopped and cored
1 small onion, chopped
3 tbsp GF flour
1/2 cup rice/soy milk
1 cup chicken stock (ensure gluten and dairy free if using store-bought)
475g can tuna (you can get away with less if you only have a smaller can), drained
1/2 tsp curry powder (ensure gf. I use Keen's.)
GF Pasta or rice for 4

Fry apple and onion in oil until lightly cooked.
Add flour and slowly stir in milk and stock to make a white sauce.
Add tuna, breaking it up well and sprinkle in the curry. Mix well.
Serve over pasta or rice.

The other night I served it with broccoli on the side, but if you want more vegies, I tend to use frozen peas & corn and a little fresh/frozen chopped spinach and put them in before the tuna to allow for a few minutes cooking time.