Toast the sesame seeds

Place the white sesame seeds in a dry frying pan over medium-low heat. Toast for 1 to 2 minutes, shaking the pan occasionally, until fragrant and lightly golden. Remove from the heat and allow them to cool slightly.

Grind the sesame

Transfer the toasted sesame seeds to a mortar and pestle. Grind until finely crushed and aromatic.

Mix the dressing

Place the ground sesame seeds in a bowl. Add the apple cider vinegar, sugar and soy sauce. Stir well with a spoon until the sugar dissolves and the dressing is smooth.