It is because it's pasta! It's cheap and it's easy.
For this dish I used a little mustard, mayo and soy sauce wich I already had.
Some diced green onions,
Small shell noodles,
1 can of drained tuna
Salt, pepper and garlic powder
So the total cost was about $3.00 and I still have some green onions and shell pasta left for another dish!
This is pretty straightforward:
1 tsp mustard
Salt, pepper and garlic to taste
Diced green onions
Mix with cooked and drained pasta. (I used 2 cups since it's just us. If you're making more you'll need to adjust the mustard, mayo and maybe use 2 cans of tuna)
Fold in drained tuna (1 can)
Chill and serve!