Method
Boil the Pasta:
Fill a large pot with water, add a generous pinch of salt, and bring to a boil.
Add the pasta and cook according to package instructions until al dente.
Reserve 1 cup of pasta water, then drain the pasta in a colander and set aside.
Sauté the Onions:
In a large skillet, heat the olive oil over medium heat.
Add the sliced onion and cook until it becomes translucent, about 5-7 minutes. Stir occasionally to prevent browning.
Add Garlic:
Once the onions are soft, add the minced garlic and red pepper flakes (if using).
Sauté for an additional minute until fragrant.
Combine Tuna:
Add the drained tuna to the skillet, breaking it apart gently with a spoon.
Stir to combine with the onions and garlic, cooking for another 2-3 minutes until heated through.
Mix in Pasta:
Add the drained pasta to the skillet and toss to combine.
If the mixture seems dry, add some reserved pasta water a little at a time until the desired consistency is achieved.
Season:
Season with salt, pepper, and a splash of lemon juice to brighten the flavors.
Mix well to ensure all ingredients are evenly coated.
Serve:
Plate the pasta and garnish with chopped parsley, if desired.
Serve warm and enjoy.