Dinner in very, very little time when you really aren't in the mood to cook and you really don't have much in the refrigerator:
Boil water. Pick and wash quite a bit of parsley and arugula (or any leafy green!). When the water is boiling, add pasta (preferably whole wheat). Cut a decent amount of butter (preferably butter from grass-fed cows, such as Kerrygold or Smjör) into smaller pieces. Go do something else for a couple minutes. When the pasta is al dente, drain and put into a mixing bowl. Quickly add the butter and the greens. Mix until the butter melts and the greens wilt. Add a lot of grated Parmigiano-Reggiano, plus some unrefined sea salt and fresh ground pepper, and mix again. Taste, reseason and plate.