1 lemon, juiced and zested, juice and zest divided
1 large egg
1 tablespoon corn starch
Salt and pepper, to taste
½ cup polenta
½ cup mayonnaise
1 tablespoon lemon juice
2 tablespoons olive oil, for frying
2 cups watercress, for serving
Directions
Cook the potatoes in boiling water until soft, roughly 12–15 minutes.
Drain and then mash the potatoes.
Leave the mashed potatoes to cool.
In a large bowl, mix together the cooled mashed potatoes with the crab meat, scallions, 1 tablespoon chopped dill, parsley, capers, lemon zest, egg, and corn starch. Season with salt and pepper, to taste.
Shape the potato-and-crab mixture into 10 evenly sized patties using your hands.
Gently coat the top and bottom of the crab cakes in the polenta.
Place the formed crab cakes onto a plate, and refrigerate for 30 minutes.
Meanwhile, mix the mayonnaise with 1 tablespoon chopped dill and the lemon juice to form the dill mayonnaise.
Heat the olive oil in a large pan over medium heat.
Fry the crab cakes for 4–5 minutes on each side, until each side is golden brown.
Serve hot, topped with a dollop of dill mayonnaise and a handful of watercress.