Pasta With Light Lemon & Wine Sauce

• 1/2 onion
• 1/2 lemon zest (grated)
• 475 ml dry wine (white)
• 300 gr your favorite shaped pasta
• 475 ml chicken broth (unsalted)
• 45 ml dijon mustard
• 40 gr margarine
• 32 gr all purpose flour
• 6 gr thyme (fresh)
• 5 gr dill (fresh)