Prawn, celery heart and radish salad with boiled dressing - 9Kitchen

Ingredients

• 2 kipfler potatoes
• For deep-frying: vegetable oil
• 1 teaspoon coriander seeds, dry-roasted
• 1 kg cooked medium king prawns, peeled, tail on
• 2 celery hearts, thinly sliced lengthways
• 1 Lebanese cucumber, thinly sliced lengthways on a mandolin
• 1 Spanish onion, thinly sliced into rings on a mandolin
• 6 radishes, thinly sliced on a mandolin
• 1 cup (loosely packed) coriander
• 125 ml (½ cup) cider vinegar
• 2 egg yolks
• 1 teaspoon caster sugar
• 1 teaspoon hot English mustard
• 1 teaspoon plain flour
• 2 teaspoons melted butter
• 2 tablespoons double cream