Pasta Salad without shells tenders

1 1/2 cups penne pasta 1/4 cup olive oil 2 tablespoons finely chopped red onion 2 tablespoons red wine vinegar 2 teaspoons whole-grain mustard 1/2 teaspoon[...]

For someone who is patently terrified of all the offerings in the deli case pasta salad universe — the tri-colore, mayo-slicked, sugar-sweetened, canned[...]