Hearty Steak and Potatoes with Balsamic-Cranberry Pan Sauce

Wash and dry all the produce. Preheat your oven to 425°F (218°C). Halve the onion, peel it, and then thinly slice it. Strip the rosemary leaves from the stems and finely chop them until you have 1 tablespoon. Discard the stems. Halve the potatoes lengthwise, and then cut them into 1 - inch - thick wedges, similar to steak fries.

Place the potatoes on a baking sheet. Drizzle a large amount of olive oil over them and add the chopped rosemary. Toss the potatoes to coat them evenly with the oil and rosemary. Season the potatoes with salt and pepper. Roast the potatoes in the preheated oven until they are lightly browned and crisp, which should take about 30 - 35 minutes.

Heat a large drizzle of oil in a medium - sized pan over medium - high heat. Add the onion and cabbage to the pan. Cook them for about 5 minutes, tossing occasionally, until they are softened. Add the mustard seeds to the pan and cook until they start to pop. Stir in the white wine vinegar, sugar, and a pinch of salt. Reduce the heat to low, cover the pan, and cook the cabbage until it is tender, which should take about 10 minutes.

While the cabbage is cooking, heat a drizzle of oil in another medium - sized pan over medium - high heat. Pat the steak dry with a paper towel. Season the steak all over with salt and pepper. Add the steak to the hot pan and sear it until it is browned and cooked to your desired doneness. Sear each side for 4 - 7 minutes. Remove the steak from the pan and set it aside to rest.

Add ½ tablespoon of balsamic vinegar, 1½ tablespoons of soy sauce, cranberry jam, and 3 tablespoons of water to the same pan. Place the pan over medium heat. Stir the ingredients in the pan to combine them. Let the mixture simmer until it reduces to a syrupy consistency, which should take about 2 - 3 minutes. Then, remove the pan from the heat.

Thinly slice the steak against the grain. Divide the steak, potatoes, and cabbage between serving plates. Drizzle the glaze over the steak and serve immediately.