Spinach and Ziti Pasta

This is another recipe of Rachael's. She got it from Rachael Ray. Looks awesome too! Thanks Rach!

What you need:
1 lb ziti (i use penne)
1-1.5 lbs ground beef
1 med onion chopped
3-4 cloves garlic, finely chopped
2 boxes frozen spinach, defrosted and squeezed dry
3 T butter
3 T flour
2 c milk
few grates fresh nutmeg (i use powder)
1 cup grated Parmigano Reggiano cheese (this is important- if you can't find it get a good aged parmesian)

What you need to do:
Boil pasta in salt water, drain. At the same time in large skillet brown meat, add onions and garlic. (6-7 mins) add spinach. In another skillet melt butter, sprinkle with flour over butter, cook 1 minute. Whisk milk into butter mixture on med high heat. cook until liquid has thickene. Add nutmeg, s and p. Add Meat/onion mixture with pasta and sauce. Mix well. Place in cassrole dish and top with cheese. Broil until golden brown.