Stuffed Tenderloin - cooking recipe

Ingredients

1 onion, diced
2 Tbsp. olive oil
1/2 lb. spinach, chopped
salt and pepper to taste
1/3 c. Parmesan cheese, shredded
3 Tbsp. tomatoes in oil, drained and chopped or chopped, fresh tomatoes to taste
1 (4 lb.) beef tenderloin

Preparation

Saute onion over medium heat until tender.
Add spinach, salt and pepper; saute until spinach wilts.
Stir in cheese and tomatoes.
Cut tenderloin lengthwise down center.
(Do not cut completely through to the bottom.)
Lay flat and spoon spinach mixture down center of tenderloin.
Secure with string. Tenderloin won't close completely.
Place cut side up in a pan/casserole dish.
Cover with foil.
Bake at 425\u00b0 for 50 minutes.