Onion Artichoke Pasta Sauce

2 jars marinated artichoke hearts sliced
1/4 c. olive oil
1 c. chopped chives *Optional
2 tbsp. minced garlic
1/2 tsp. dried oregano
1/2 tsp. dried basil
1 tbsp. black pepper
1/2 tsp. salt
1 can (28 oz.) plum tomatoes or canned diced tomatoes
1/4 c. grated Parmesan

Drain artichokes, reserve marinade. Heat olive oil in large saucepan. Add onions, garlic, oregano, salt, basil, pepper and marinade. Saute over low heat until onions are soft (10-15 minutes). Add tomatoes and simmer for 30 minutes. Add artichokes and Parmesan. Stir and simmer 5 minutes. Sauce for 1 pound pasta.