Steam potatoes until tender, let cool and cut in half.
Rub salmon skin with salt and 1 tsp of KEEN’S mustard powder. BBQ or panfry the salmon fillets on a moderate preheated grill plate until cooked.
Combine the 3 tsp of KEEN’S mustard powder with sugar, salt and vinegar. Slowly add in the oil whilst whisking until smooth. Stir through dill and drizzle over salmon and potatoes before serving.