Toast the sourdough bread and drizzle it with a spoonful of the oil from the sardine tin.
Finely chop the red onion, cucumber, dill, and capers.
Place the drained sardines into a small bowl and mash them well with a fork.
Add the chopped red onion, cucumber, dill, capers, mayonnaise, mustard, and the juice of half a lemon to the mashed sardines. Stir until thoroughly combined.
Scoop the sardine salad onto the prepared toast and spread it out evenly.
Garnish the sandwich with freshly chopped chives and a sprinkle of sesame seeds before serving.
Cook it hands-free.
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