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1. Bring a very large pot of heavily salted water to a boil.
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2. Open the sardine tin and drain a tablespoon or so of the oil into a wide skillet (the amount of oil in the tin will vary by brand, so add additional extra virgin olive oil if necessary to make up a tablespoon). Warm the oil over medium-low heat and add the garlic, cooking until fragrant.
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3. Trim the fennel and slice the bulb very thinly (a mandoline works great here). Add to the skillet with a sprinkle of salt, raise the heat to medium, and cook until the fennel is soft and beginning to caramelize. Add the chile flakes and let them sizzle for a minute, just until fragrant, then add the tomatoes with their juice. Cook until the liquid is reduced, then add the vermouth and let that reduce slightly.
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4. Add the sardines to the skillet with the tomato and fennel mixture, breaking up slightly but leaving some chunks. Zest the lemon and combine a tablespoon or so of zest with the toasted breadcrumbs, then set aside. Juice the lemon and add the juice to the pan. Taste and adjust salt if necessary.
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5. Add the linguine to the boiling salted water, cooking it until it is just short of al dente. Using tongs, transfer the linguine to the sauce to finish cooking, adding a little bit of the starchy pasta water and tossing gently to combine. (You'll want to leave this a little wet, as the breadcrumbs will soak up the sauce and dry the pasta out a bit once you've added them.)
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6. Transfer the pasta and sauce to a large warmed serving bowl (or individual pasta bowls), add a drizzle of olive oil, sprinkle on the toasted breadcrumb-lemon zest mixture, and garnish with picked small fennel fronds and the remaining lemon zest.
