Step 1: Preheat oven to 100C and line a baking tray with baking paper.
Step 2: Combine the potato and onion in a large bowl and transfer to a colander and using your hands to squeeze as much liquid from the potato mixture as possible and transfer to potato mixture to a medium bowl and stir in the butter and season well.
Step 3: Add enough oil in a large non-stick frying pan to cover the base and place over a medium heat.
Step 4: Spoon two 1/2 cup portions of mixture into the pan and using a spatula to flatten each portion to a 10cm disc and cook for 3 to 4 minutes each side or until golden brown and cooked through.
Step 5: Transfer to a heatproof plate line with paper towel and place in oven keep warm and repeat in 3 more batches with the remaining potato mixture producing 8 rosti.
Step 6: Meanwhile, bring a saucepan of water to a simmer over high heat and add vinegar and crack 1 egg into a small bowl and stir the water to create a whirlpool and pour the egg into the centre and cook, without stirring, for 3 minutes for a runny yolk or until cooked to your liking and using a slotted spoon to transfer to a bowl and repeat with remaining eggs.
Step 7: To make the chive & dill dressing whisk oil, vinegar, mustard, chives, dill and capers in a bowl until combined and season or alternative put all the ingredients into a screw top jar and screw the lid on and shake vigorously to combine.
Step 8: Divide rosti, salmon, avocado, rocket and poached eggs among serving plates and drizzle with dressing.
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