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["Place red wine, fennel seeds, crushed red pepper, and thyme sprigs in a small saucepan; bring to a simmer over high. Reduce heat to medium, and simmer, stirring occasionally, until reduced to 3/4 cup, about 10 minutes. Cool completely, about 10 minutes. Pour wine mixture through a fine wire-mesh strainer; discard solids. Place steak in a large ziplock plastic bag. Add wine mixture, seal bag, and turn to coat steak. Marinate in refrigerator, turning occasionally, 4 hours or overnight.", "Preheat oven to 400u00b0F.", "Place red onion wedges in a 13- x 9-inch glass baking dish. Add vinegar, 1/4 cup water, 1/4 teaspoon salt, and 1/2 teaspoon black pepper; cover with foil. Bake at 400u00b0F for 45 minutes; turn onions over. Uncover and bake until liquid is syrupy and onions are tender, about 20 minutes. Remove and discard root ends from onion wedges; separate the onion wedges into ""petals.""
