Penne With Artichoke Hearts

• 9 ozs artichoke hearts
• 8 ozs spinach washed (fresh)
• 2 garlic (cloves minced)
• 1 penne al dente (cooked)
• 1 lemon zest (grated)
• 90 gr fat free ricotta cheese
• 90 ml dry wine (white)
• 45 ml lemon juice
• 1 slice onion thinly (sliced)