This is my staple for 2 people:
Good EV olive oil
Teaspoon chili flakes (or less depending on how hot you like it)
Shallots or one small white onion
Seafood mix
100ml white wine
Handful cherry tomatoes
Lemon
Fresh parsley
Boil water, add a teaspoon sea salt then add the tagliatelle and simmer s
Meanwhile...
Heat two tablespoons olive oil on a medium heat with the chili flakes
add the chopped onion or shallot and fry until translucent. You don't want brown bits.
throw in the halved cherry tomatoes and cook down for a few minutes, breaking them down with the back of a spoon
add seafood to heat through - how long depends on whether they are pre-cooked or not, but be careful not to overcook as they will be rubbery
add juice of half a lemon
add a half ladle of the pasta water
test sauce for seasoning, add salt if needed (remember the seafood and pasta water are quite salty) and a good dose pepper
drain the pasta and add to the sauce (you want it al dente - 7 or 8 minutes should be plenty, as it will cook further in the sauce)
add loads of fresh chopped fresh parsley
Hope that helps