Heat chicken stock and white wine together in a saucepan. Rinse shrimp shells and add to pan along with remainder of ingredients. Bring just to the boil then reduce heat and gently simmer partially covered for 5-10 minutes (boiling causes stock to be cloudy). Strain carefully and let stock sit undisturbed for a few minutes to allow any solids to settle. Carefully transfer to another container leaving solids behind.