About the melding of sweet and sour flavors in this recipe, Food Guy Greg Patent writes: "Roasted butternut squash and Brussels sprouts, with a red onion sweet and sour sauce. It’s a terrific side dish to serve with a main dish meat or vegetable - and you make it ahead! I’m a big fan of sweet/sour dishes because they deliver a big punch of flavor. Just about every cuisine features something that’s sweet and sour. Think Chinese sweet and sour chicken, shrimp, or pork; or German Sauerbraten; or