Top tip: For the coldest serve, place your martini glass in the freezer overnight before making the cocktail - a properly frozen glass helps maintain the Martini's texture and temperature from first sip to last.

For the sardine oil-washed gin: Combine the gin and sardine-infused olive oil in a container and mix briefly. Place in the freezer for approximately 2 hours, until the oil has solidified. Strain through a coffee filter or muslin cloth to remove the fat. The result is your sardine oil-washed gin.

Add the oil-washed gin, dry vermouth, lemon brine, and rock samphire to an ice-filled mixing glass. Stir until thoroughly chilled and diluted, then fine strain into the frozen martini glass and garnish.