Begin by sprinkling the flour on to a dinner plate, then season with salt and pepper. generously coat the sardines in flour, shake off excess and place on a clean plate. Heat the sunflower oil in a shallow pan until it shimmers. Fry the sardines in batches until just cooked through, approximately 2-3 minutes, depending on their size. Set to one side.
Now heat another pan with 2 tablespoons of olive oil. Chop the garlic and tip into the pan, stir but don’t colour the garlic. Now add the skinned cherry tomatoes. Stir and turn the heat up add pour in the sherry vinegar, let it bubble and deglaze, by this I mean it should reduce by half. Then add the chilli and pimenton, then finally the passata rustica with the herbs. Season with salt and pepper and bring to a simmer and cook for 20 minutes. Check the seasoning and set to one side.
In a suitable dish pour half of the tomato sauce, then arrange the sardines on top. Pour the remaining tomato sauce on the. Marinate in the fridge for 24-36 hours.
Serve at room temperature with a mixed leaf salad, crusty bread and a crisp glass of white wine is also recommended.