Step 1Bring a large pot of salted water to a boil. Cook the pasta according to package directions to al dente. Reserve one-half cup of the cooking liquid and drain the pasta.
Step 2Place the arugula, lemon peel, garlic, olives, one-fourth cup of the almonds, one-fourth cup of the grated Parmesan cheese and the salt in a food processor. Pulse until it forms a thick paste. Slowly drizzle in the olive oil and process until smooth.
Step 3Place the pasta in a bowl and stir in the pesto. Drizzle in the reserved cooking liquid until the sauce is the thickness desired. Garnish each plate with the remaining almonds and Parmesan. Sprinkle with the diced tomatoes and serve warm or chilled.