Bring a pot of salted water to a boil. Add pasta and cook until tender but still firm to the bite, about 10 minutes.
Place olive oil, tuna, peas, lemon juice, olive paste and pepper flakes in a mixing bowl and mix well with a fork.
When pasta is cooked, drain it thoroughly and return it to the pot, off heat, add tuna mixture to the pot and toss to combine; cover the pot and let mixture sit for a minute to heat through. Season to taste with salt and more pepper flakes if you wish.
Leftovers are delicious served as a salad with mustard mayonnaise dressing or with a vinaigrette; chopped fresh tomatoes are a nice addition as would be chopped fresh parsley.