Mix all the dressing ingredients together and season to taste with salt and pepper.
Keep it chilled until ready to serve.
Gambas al ajillo
Peel and clean the prawns, making sure to remove the vein along both the back and the underside. Pat them dry with a little kitchen paper.
Slice the chilli, taste it and judge from its heat how much you want to add to the mixture.
Combine the butter, oil, chilli and garlic in a saucepan, season with salt and pepper and let it simmer gently for 10-15 min. so the mixture takes on plenty of flavour. Stir in the parsley at the end.
Spread the prawns out in a small ovenproof dish, pour the hot oil mixture over them and bake in a preheated conventional oven (top and bottom heat) at 200°C for 10 min.
Burger
Warm the burger buns.
Spread the bottom halves with dill dressing and top each with a good handful of salad leaves.
Divide the prawns between the burgers. Drizzle over some of the butter and oil mixture too – make sure some of the garlic and chilli goes over the prawns as well; it adds wonderful flavour.
Finish with the top half of the bun, also spread with dill dressing.