Preheat the oven to 425.
In a oven-proof large non-stick skillet (I like Oxo), heat the olive oil until smoking. Drizzle some more olive oil over the fennel, and season with salt and pepper. Place cut-side down in the skillet and leave alone for a few minutes. Pop into the oven and roast for 10 minutes, then start to check to see if the cut-side is deep, golden brown. When it is, carefully use tongs to flip the fennel over. Keep roasting until a knife goes through the base of the fennel easily (about 30 minutes more). You may need to move the fennel around to keep it from burning on any one side. When it comes out of the oven, immediately squeeze the lemon over everything.
Meanwhile, cover your golden raisins with red wine vinegar just enough to cover and allow to sit for 20 minutes. To make your couscous, bring the chicken stock to a boil, add the olive oil or butter, some salt, and then the couscous. Immediately turn off the heat, cover, and leave for five minutes. Fluff with a fork and then work in the marinated raisins.
For the breadcrumbs, heat a large non-stick skillet and add the olive oil, the garlic, and the anchovy paste. Cook just until the anchovy paste is melted into the oil and the garlic is starting to become fragrant (but not to color). Add all of the panko and work with a heatproof rubber spatula, occasionally tossing the breadcrumbs by thrusting the pan forward and back. Keep toasting the breadcrumbs (add a pinch of salt) until deep, golden brown. Make sure the garlic doesn’t burn.
Pour the toasted breadcrumbs into a bowl and add the remaining ingredients. Taste for salt and pepper.
To finish, spoon some couscous on to plates, top with the roasted fennel, place some sardines on top (drizzle the sardine oil over the fennel), sprinkle on the toasted breadcrumbs. Place a lemon wedge on the side of the plate, drizzle with some more olive oil, and sprinkle parsley and Aleppo pepper over everything.