Pasta with Salmon, Spinach and Capers

What to do with leftover smoked salmon?  I threw this together and it is really easy, low fat but creamy and delicious, and super healthy.
This is for 2 people.

6 oz pasta, cooked
2 T butter
one onion, chopped
1 to 2 T flour
¼ to ½ c. skim milk (or any milk)
¼ to ½ c. white wine
½ package frozen spinach
3. oz (or so) smoked salmon (mine was smoked sockeye salmon from Costco)
1 T. grated parmesan cheese
1 T. capers

While the pasta is boiling:

In a large deep frying pan over medium to high heat, melt 2 T. butter.
Add the sliced onion, sauteing until it softens.
Add the flour and incorporate.
Gently add milk, stir, and let boil.  It will quickly thicken.
Add the wine and stir.
Add the chopped spinach and the smoked salmon, breaking it up into small pieces
Add capers and parmesan.
Add grated pepper to taste.