2 tablespoons extra-virgin olive oil plus extra for brushing on the potato slices
1 large russet potato (about 12 ounces), scrubbed but not peeled
2 tablespoons sherry vinegar
1 tablespoon fresh lemon juice
1 tablespoon Worcestershire sauce
2 teaspoons minced garlic
1/3 cup extra-virgin olive oil
1/3 cup sour cream
3 ounces blue cheese, crumbled (about ¾ cup)
1¼ pounds chuck steak (1 to 1¼ inches thick)
10 ounces baby spinach
2 cups cherry tomatoes
2 cups sliced English cucumber
Preheat the oven to 350 degrees. Line two sheet pans with parchment and brush the parchment lightly with some oil. Slice the potato lengthwise 1/8-inch thick, preferably using a mandolin, and arrange the slices in one layer on the sheet pans. Brush the tops of the slices lightly with oil and working with one sheet pan at a time, sprinkle the potato slices lightly with salt and bake them on the middle shelf of the oven until they are golden brown, about 20 to 25 minutes, removing the chips to a paper towel lined plate as they become golden. (They may not all brown at the same pace.) Do not let them get too dark in color; it is OK if they have a few lighter patches.
In a bowl whisk together the vinegar, lemon juice, Worcestershire sauce and garlic. Add the oil slowly in a stream, whisking, until all of it is added. Whisk in the sour cream and gently stir in the blue cheese. Add salt and pepper to taste.
Heat grill to medium high heat.
Or if cooking inside, in a large skillet heat the oil over high heat. Add the steak, seasoned on both sides with salt and pepper; cook it for 5 minutes a side for medium-rare. Transfer the steak to a plate and let it rest for 8 minutes before slicing it.
To serve: Add any juices from the steak plate to the blue cheese dressing. Slice the steak very thin at an angle across the grain. In a large salad bowl combine the spinach with the tomatoes and cucumber slices, add some of the dressing, reserving a little to drizzle on top and toss the salad well. Mound the salad on each of six plates, top with the steak slices and the potato chips, broken into large pieces and drizzle each portion with a little more dressing.
Nutrition information per serving: 523 calories; 353 calories from fat; 39 g fat (13 g saturated; 1 g trans fats); 84 mg cholesterol; 580 mg sodium; 17 g carbohydrate; 3 g fiber; 3 g sugar; 24 g protein.