ATK Spanish Tortilla with Garlic Mayonnaise

2 large egg yolks

2 tsp. Dijon mustard

2 tsp. lemon juice

1 garlic clove, minced

¾ C. vegetable oil

1 T. water

½ tsp. salt

1/4 tsp. pepper

1.4 C. extra-virgin olive oil

 

1 ½ pounds Yukon Gold potatoes, peeled, quartered lengthwise, and sliced  crosswise 1/8 inch thick

1 small onion, halved and sliced thin

6 T. plus 1 tsp. extra-virgin olive oil

Salt and pepper

8 large eggs

1/2 C. jarred roasted red peppers, rinsed, patted dry, and cut into 1/2-inch 2 pieces

1/2 C. frozen peas, thawed

 

FOR THE GARLIC MAYONNAISE: Process egg yolks, mustard, lemon juice, and garlic in food processor until combined, about 10 seconds. With processor running, slowly drizzle in vegetable oil, about 1 minute. Transfer mixture to medium bowl and whisk in water, salt, and pepper. Whisking constantly, slowly drizzle in olive oil. (Mayonnaise can be refrigerated for up to 4 days. Makes 1 1/4 cups.) FOR THE TORTILLA: Toss potatoes, onion, 1/4 C. oil, 1/2 tsp. salt, and 1/4 tsp. pepper in large bowl. Heat 2 T. oil in 10-inch nonstick skillet over medium-high heat until shimmering. Add potato mixture and reduce heat to medium-low. Cover and cook, stirring occasionally, until potatoes are tender, 22 to 28 minutes. In now-empty bowl, whisk eggs with 1/2 tsp. salt. Fold in hot potatoes, roasted red peppers, and peas. Heat remaining 1 tsp. oil in now-empty7 skillet over medium-high heat until just smoking. Add egg-potato mixture and cook, shaking pan and folding mixture constantly, for 15 seconds. Smooth top of mixture and reduce heat to medium. Cover and cook, gently shaking pan every 30 seconds, until bottom is golden brown, and top is lightly set, about 2 minutes. Using rubber spatula, loosen tortilla from pan. Shake pan gently until tortilla slides around freely, then slide tortilla onto large plate. Invert tortilla onto second large plate, then slide back into skillet, browned side up. Tuck in tortilla edges and continue to cook over medium heat, gently shaking often, until second side is golden brown, about 2 minutes. Slide tortilla onto cutting board and let cool for 15 minutes. (Tortilla can be held at room temperature for up to 4 hours.) Cut into wedges or squares and serve warm or at room temperature.