Instructions

  1. Melt butter in a heavy large skillet over medium heat.
  2. Add garlic, lemon peel and herbs; cook stirring occasionally approximately 5 minutes, being careful not to burn garlic.
  3. Gradually add flour, stir till blended.
  4. Gradually add wine, stir till blended.
  5. Season with salt and pepper.
  6. Stir until sauce thickens, about 1 minute.
  7. Mix in tuna, heat through.
  8. Place shells in serving bowl, pour sauce over and toss.
  9. Garnish with lemon wedges and freshly grated Parmesan cheese.