Wash the dandelion buds well and pat dry. Bring the apple vinegar and water to the boil in a pot and simmer the buds briefly.
Remove and place in a preserving jar, fill with hot stock and close tightly.
Store in a dark and cool place for 2 weeks to develop the best flavour.
TIP: Use like normal capers, e.g. to season "vitello tonnato", or simply enjoy on toasted bread with olive oil.