Add chorizo and spring onion to mixer bowl. Chop for 3 sec/speed 7/MC on, scrape mixer bowl down and repeat.
Add olive oil and cook for 4 min/steaming temp/speed 1/MC off. Scrape mixer bowl down.
Cook for a further 3 min/steaming temp/speed 1/MC off. Scrape mixer bowl down.
Add Worcestershire sauce and mix for 3 sec/speed 3/MC on.
Arrange oysters in rocks salt to ensure they balanced, spoon over mixture and garnish with finely chopped spring onion - alternatively spoon over mixture and grill for 5 min before serving for a Kilpatrick style oyster. Finish with two drops of balsamic vinegar each oyster.