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boil 4 cups of water in a saucepan, add some salt,and the shell pasta to it.add one teaspoon of oil to it.cook the pasta till it has a bite to it(not raw,neither too soft).drain the water,retaining about 4-5 tablespoons of the pasta water.
in a separate saucepan heat oil and add thinly sliced onions,add a little salt and saute till it gets a brown colour (caramelise the onions).