Pre heat oven to 400 degrees.
In a blender combine the toasted almonds, paprika, cayenne pepper, salt, white pepper, 3 tsp. sherry vinegar and 4 Tbsp. extra virgin olive oil. Blend until smooth. Set aside. Spray rimmed baking sheet with cooking spray. Place the sliced fingerlings potatoes on the baking sheet and drizzle with 2 Tbsp. extra virgin olive oil, tossing to coat. Roast in the oven for 15 minutes until the potatoes are golden brown and tender. Remove pan from the oven.
While potatoes are roasting, in a small bowl, mix remaining 1 tsp. sherry wine vinegar with the 1 Tbsp. extra virgin olive oil. Place the arugula in a large bowl and drizzle with the sherry wine vinegar and olive oil mixture, toss to coat. Season with salt and cracked pepper to taste, if desired.
Divide the arugula among 6 plates. Place fingerlings on top of the arugula and top each plate with 1 -2 Tbsp. of the red bell pepper sauce. Garnish with lemon zest if desired.