2 5-ounce cans best quality tuna packed in water, drainedI didn't quite use all of the second can, that's up to you
large handful of fresh dill frondschopped
1/2small red onionpeeled, halved, and thinly sliced
about 1/2 tsp red pepper flakes
freshly cracked black pepper
Cook the pasta in lots of well salted boiling water according to the package directions until just al dente. As a general rule I taste the pasta a full 2 minutes before the cooking time on the package.
Put the rest of the ingredients in a large skillet. Break up the tuna with a fork into large chunks and heat gently on medium just until everything is hot.
Drain the pasta and add to the skillet, it's ok if a little cooking water comes along. Toss everything well and add a little more oil if needed.