Food & Cooking Recipes Healthy Recipes Vegetarian Recipes Red Onions Stuffed with Parsley Breadcrumbs Be the first to rate & review! By Martha Stewart Test Kitchen Martha Stewart Test Kitchen The recipes developed by our test kitchen team have undergone a rigorous process of development and testing, ensuring that every element is optimal, from ingredient amounts to method and cooking time. This process includes triple-testing recipes to ensure they meet our high standards. The many stellar cooks and food editors who have been part of our team include Sarah Carey, Lucinda Scala Quinn, Jennifer Aaronson, Shira Bocar, Anna Kovel, Greg Lofts, Riley Wofford, Lauren Tyrell, and Lindsay Leopold. Editorial Guidelines Updated on October 19, 2020 Print Rate It Share Share Tweet Pin Email Photo: Paola + Murray Prep Time: 30 mins Total Time: 1 hrs 30 mins Servings: 8 Round out your holiday menu with this striking side. These slow-roasted red onions are stuffed with a breadcrumb-parsley filling that is basted with the sweet onion as it cooks. They make a great compliment to mashed potatoes and gravy. Ingredients 7 to 8 slices white sandwich bread, crusts removed, torn into bite-size pieces 8 medium red onions (about 3 ½ pounds), peeled ¼ cup extra-virgin olive oil, plus more for drizzling Kosher salt and freshly ground pepper Pinch of cayenne pepper 3 cups parsley leaves (from 1 bunch) Finely grated zest of 1 small lemon (a scant 1 teaspoon) Directions Pulse bread in a food processor to coarse (pea-size) crumbs. Spread breadcrumbs on a rimmed baking sheet and let stand at room temperature until stale, at least 12 hours and up to 1 day. (You can also quickly dry out breadcrumbs on a rimmed sheet by baking them in a 225°F oven, stirring once, until dry and beginning to crisp but not develop color, 25 to 30 minutes.) Preheat oven to 400°F. Trim root ends of onions just enough to stand upright but remain intact. Cut top inch off of onions and scoop out several layers from centers with a teaspoon or melon baller; finely chop removed layers and reserve for stuffing mixture (you should have about 1 1/2 cups). Arrange onions, hollowed-sides up, in a baking dish just large enough to hold them snugly side-by-side. Pour a few tablespoons of water into dish. Drizzle onions with oil and season with 1 teaspoon salt. Cover dish with parchment-lined foil. Bake 30 minutes. Uncover and continue baking until tender but still holding shape, 20 to 25 minutes more. Remove from oven; increase temperature to 425°F. Meanwhile, heat 2 tablespoons oil in a small skillet over medium-low. Add reserved chopped onion and cayenne. Cook, stirring occasionally, until soft and golden, about 15 minutes. Transfer to a bowl; let cool slightly. In a food processor, pulse breadcrumbs and parsley just to combine and break down parsley (do not over-process; crumbs should still be coarse). Transfer to bowl with onion mixture, along with lemon zest and remaining 2 tablespoons oil; stir to combine and season to taste. Divide stuffing evenly among onions and drizzle with more oil. Roast until stuffing is golden brown on top, about 25 minutes (if bottoms become dry, add a few more tablespoons water to dish; if tops are browning too quickly, tent with foil). Serve warm. Rate it Print