Rigatoni Al Forno with Roasted Asparagus

Yield: 4 Servings
Categories: Pasta, Vegetarian
2tbOlive oil; may be doubled
3cChopped onion; large chunks
3/4lbRigatoni; or similar grooved, tubular pasta
1lbAsparagus; cut into 2" pieces
1/2tsSalt; plus more to taste
3tbBalsamic vinegar; (3 to 4 tbs)
Freshly ground black pepper
1/3cGrated parmesan cheese; (plus extra for the top)
1/2cBread crumbs
Balsamic vinegar; to serve
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