3 grain penne walnuts caramelized Recipes

onions (about 4 lbs.), peeled and thinly sliced, olive oil, sugar, salt, walnut halves, whole-grain penne or fusilli pasta, ricotta salata, crumbled (see notes ), loosely packed flat-leaf parsley, chopped, fresh lemon juice, freshly ground black pepper

onions, peeled and thinly sliced, olive oil, sugar, salt (to taste), walnut halves or 1 3/4 cups cashews, whole wheat penne or 10 oz whole wheat fusilli, ricotta salata or 1 lb feta cheese, crumbled, loosely packed flat leaf parsley, chopped, fresh lemon juice (plese not the bottled stuff), fresh ground black pepper, crushed red pepper flakes (optional)