Father's Day steak sandwich

Instructions

• Slice onion in half lengthwise, then slice each half into thin strips. Melt butter in a large, wide frying pan over medium heat. Add onion and sprinkle with 1/2 teaspoon (2 mL) salt. Stir often until soft, 5 to 7 minutes. Meanwhile, brush steak with oil. Sprinkle both sides with remaining 1/2 teaspoon (2 mL) salt and pinches of pepper. Slice tomatoes into thick rounds. Slice baguette in half horizontally, then in half vertically for 2 sandwiches.

• Remove onion to a plate. Increase heat to medium-high. Add steak to pan. Add a little oil, if needed. Cook 2 minutes per side. Reduce heat to medium. Cook, uncovered and turning occasionally, 5 to 6 minutes for medium-rare steak. Remove to a cutting board. Return onion to pan with tomatoes. Sprinkle with chili flakes. Stir often until tomatoes begin to soften, 1 to 2 minutes. Remove from heat. Slice meat into thin strips and arrange over bottom halves of baguette. Drizzle any juices from cutting board overtop. Top with onion and tomatoes. Cover with top halves of baguette.