In this 20-minute weeknight pasta, one of the tastiest, most versatile sauces, aioli (or garlic mayonnaise) is dolloped over a simple bowl of spaghetti tossed with wilted greens. With hardly any cooking and minimal knifework, this one-pot dish starts out by simply cooking the pasta. Meanwhile, a quick aioli is whipped up by stirring garlic, lemon and a little olive oil into store-bought mayonnaise. You’ll generously spoon that shortcut aioli over the pasta, coating each noodle with its rich…