Would you make meals at home more often if you could do it like a Food Network star, with the fish already filleted, the carrots julienned and ready, and the knowledge that every required seasoning was within arm's reach? That's the premise of a new Cambridge start-up, Of Course Meals, which is cranking up operations this week. The company delivers a box of prepped ingredients to your home on Sunday evening. Inside the box are the items you need to make two, three, or four meals for a family of four. The proposition is that you spend less time grocery shopping, and less time cooking (the meals take about a half-hour to cook), but still provide healthy, home-cooked food for your family. ...