Before starting, wash and dry all produce. Peel, then cut potatoes into 1/2-inch pieces. Add potatoes, 2 tsp salt and enough water to cover (by approx. 1 inch) to a large pot (use same for 4 ppl). Cover and bring to a boil over high heat. Once boiling, reduce heat to medium. Simmer uncovered until fork-tender, 10-12 min. Drain and return potatoes to the same pot, off heat. Mash 2 tbsp butter and 3 tbsp milk (dbl both for 4 ppl) into potatoes until creamy. Season with salt and pepper, to taste.

Meanwhile, add pork, breadcrumbs, half the Dijon, half the Worcestershire sauce and 1/4 tsp salt to a medium bowl. Season with pepper, then combine. Form pork mixture into 2 equal-sized, 1-inch-thick patties (4 patties for 4 ppl). Heat a large non-stick pan over medium heat. When hot, add 1/2 tbsp oil (dbl for 4 ppl), then patties. Cook until golden-brown, 3-4 min per side. (NOTE: It's okay if patties don't cook all the way through in this step.) Transfer patties to a plate.

Meanwhile, add vinegar, remaining Dijon, 1/2 tsp sugar and 1 1/2 tbsp oil (dbl both for 4 ppl) to a large bowl. Season with salt and pepper, to taste, then whisk to combine. Core, then cut apple into 1/4-inch slices. Add apples to vinaigrette, then toss to coat. Quarter mushrooms.

Return the same pan (from step 2) to medium-high. Add 1 tbsp oil (dbl for 4 ppl), then mushrooms. Cook, stirring occasionally, until golden-brown, 3-4 min. Season with salt and pepper. Add 1 tbsp butter (dbl for 4 ppl), then swirl the pan until melted. Sprinkle Gravy Spice Blend over mushrooms, then stir until coated, 30 sec.

Gradually whisk in 3/4 cup water (dbl for 4 ppl), broth concentrate and remaining Worcestershire sauce into the pan with mushrooms until combined. Return patties to the pan and bring gravy to a simmer. Once simmering, reduce heat to medium. Cover and cook, stirring occasionally and flipping patties halfway through, until cooked through, 3-4 min.** (TIP: Add water, 1 tbsp at a time, if gravy reduces too much!) Season with salt and pepper, to taste.

Add arugula and spinach to the bowl with apples and vinaigrette, then toss to combine. Divide mash and patties between plates, then spoon mushroom gravy over top. Serve salad alongside.