1 kg new potatoes a big (grapefruit-sized) bulb of celeriac 2 Tbsp (30 ml) olive oil 4 spring onions, finely sliced 2 fillets of smoked trout a bunch of watercress salt and milled black pepper For the dressing juice of a lemon finely grated zest of half a lemon 1 Tbsp (15 ml) finely chopped […]