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Export 6 ingredients for grocery delivery
Step 1
Heat oil in heavy large skillet over medium heat.
Step 2
Add chopped onions and saute until tender and beginning to brown, about 10 minutes.
Step 3
Add leeks, green onions and shallots, saute until very tender, stirring often, about 10 minutes.
Step 4
Meanwhile, cook pasta in large pot of boiling salted water until just tender but still firm to bite.
Step 5
Drain well, reserve 1/2 cup pasta cooking liquid.
Step 6
Return pasta to same pot.
Step 7
Add onion mixture, toss to combine.
Step 8
Mix in reserved cooking liquid by tablespoonfuls if pasta is dry.
Step 9
Mix in cheese, season with salt and pepper.
Step 10
Transfer to large bowl, serve.