- combine the lemon zest, rosemary needles, flat-parsley leaves and coarse salt in a food processor and pulse until finer and well mixed and set aside
- peel the 7 onions, slice 6 onions in half and 1 onion into thinner smaller slivers (for stuffing the sardines)
- preheat the oven to 200°C with the rack in the middle
- cover onion half-slices with 2 tbsp of olive oil and sprinkle with 2-4 tbsp of aromatic lemon & herb salt and bake for 15 minutes
- clean your fish, slice the underside, remove the insides and rinse with cold water and let drain
- sprinkle the insides and outsides of your sardines with 4 tbsp aromatic salt and fill each with onion slices
- remove the roasting dish with baked half-onions from the oven and add the sardines in between
- place oven rack towards the top and bake the sardines (with the half-baked half-onions too) for 5-7 minutes on each side (total baking time 10-14 minutes)
- remove from oven and serve with baby lettuce salad spears (see recipe here).
note : reserve the remaining lemon & herb aromatic salt in a small jar in the refrigerator for next time !
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