Rigatoni Al Forno with Roasted Asparagus
| Yield: | 4 Servings | 
| Categories: | Pasta, Vegetarian | 
| 2 | tb | Olive oil; may be doubled | 
| 3 | c | Chopped onion; large chunks | 
| 3/4 | lb | Rigatoni; or similar grooved, tubular pasta | 
| 1 | lb | Asparagus; cut into 2" pieces | 
| 1/2 | ts | Salt; plus more to taste | 
| 3 | tb | Balsamic vinegar; (3 to 4 tbs) | 
| Freshly ground black pepper | ||
| 1/3 | c | Grated parmesan cheese; (plus extra for the top) | 
| 1/2 | c | Bread crumbs | 
| Balsamic vinegar; to serve | 
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