Place the sardines on the slices of sourdough toast and gently mash them slightly with a fork.
In a small bowl, whisk together the extra virgin olive oil, mustard, lemon juice, salt, pepper, and chili flakes to create the sauce.
Spoon the prepared mustard sauce generously over the sardines on the toast.
Top the toast with thinly sliced red onion, capers, fresh dill, and freshly chopped parsley.
Cook it hands-free.
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