The best way to prepare it is in a 1 l juice or milk bottle with a large opening.
Pour the rock sugar into the bottle, top up with sea buckthorn juice and double grain. Place the bottle in a sunny place until the rock candy has dissolved (2-3 weeks). Shake it every now and then. (The smaller the rock candy, the faster it dissolves.
Then add a shot glass full of multivitamin juice and shake.
The recipe makes approx. 750 ml of finished liqueur.