1 tbspSwedish mustard (see note)1 tspDijon mustard2 tspcaster sugar90 mlolive oil30 mllemon juice, or to taste2 tbspfinely chopped dill2 tspjarred horseradish, or to taste (optional)
Whisk mustard and sugar in a bowl to combine, gradually add olive oil in a thin steady stream, whisking until thick and emulsified. Whisk in remaining ingredients, season to taste and serve with gravlax.
Note Makes about 150ml. Swedish mustard is
available from select delicatessens.