UPDATED TUNA NOODLE CASSEROLE
Serves 4 to 6.
Note: Orecchiette (the ear-shaped pasta) are particularly good in this dish, as they offer nooks where peas can nestle. But any short noodle will do, including penne, shells and egg noodles. Use the water in the can that the tuna was packed in, for extra flavor. Same with the celery leaves and parsley stems; don't throw them away. If you stuff stale bread in the freezer, fresh breadcrumbs are moments away; just whirl them in a food processor. Dry crusts may not process as finely, but consider that a bonus: Those buttery chunks add texture to the casserole. From Jo Marshall.
• 8 oz orecchiette or other short noodle (see Note)
• 1 stick butter (8 tbsp., divided), plus more for buttering dish
• 1 large onion, chopped
• 2 ribs celery, thinly sliced, leaves included (see Note)
• 1 red bell pepper, chopped
• 5 to 6 oz. cremini mushrooms, sliced