Asparagus and pea pasta with caramelized onion sauce

Delicious Spring asparagus and pea pasta with caramelized onion sauce recipe! Easy to prepare, and loaded with rich flavor!

6 Tablespoons salted butter
4 Tablespoons olive oil
3 large sweet yellow onions, peeled and cut into ¼” slices
1 Tablespoon sugar
1 lb thin fresh asparagus, tough ends removed
10 oz fresh English peas
⅓ cup sherry cooking wine
10 oz fresh egg pasta noodles, like fettuccine or linguine
½ cup freshly grated parmesan cheese, plus more for serving
Salt and pepper

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