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Follow our triangular bread-thins recipe to make your own. While they bake, bring a small pan of water to the boil and add a good squeeze of lemon, a few dill sprigs and the sliced onion. Add the fish and leave to poach for 8-10 mins or until it flakes easily. Lift from the pan and and flake into pieces.
Scoop the avocado into a bowl and roughly mash with a generous squeeze of lemon. Cut the bread triangles in half, put cut-side up and top with the avocado, scatter over half the chopped onion, then top with salmon, more onions and some snipped dill. Squeeze over some lemon to serve.