Scallops with kefir and sorrel sauce and pickled celeriac

By Helena Puolakka From Saturday Kitchen Ingredients For the kefir sorrel sauce 1 tbsp Dijon mustard 1 tsp honey ½ lemon, juice and zest 100g/3½oz sorrel 200ml/7fl oz rapeseed oil 25ml/1fl oz white wine vinegar 250ml/9fl oz kefir salt, to taste For …