Greek Chicken Salad

Name: Greek Chicken Salad
Ingredients: 2 lemons (juiced); ½ cup olive oil; 6 cloves garlic (peeled, smashed and minced); 1 teaspoon kosher salt; 2 teaspoons freshly ground black pepper; 2 teaspoons ground cumin; 2 teaspoons paprika; ½ teaspoon dried oregano; ½ teaspoon red-pepper flakes; 2 pounds boneless skinless chicken thighs; 2 cups fresh arugula; Fresh parsley (torn); 1/2 cup cherry tomatoes (halves); 1/2 cup crumbled feta cheese; 1/2 cup diced cucumber; pickled red onions (recipe below); 1 lemon (juiced); 2 teaspoons champagne vinegar; 1/3 cup olive oil; 2 cloves garlic (minced); 1/2 shallot (minced); kosher salt to taste; fresh oregano; 1/2 cups apple cider vinegar; 1 tablespoon white sugar; 1 1/2 teaspoons kosher salt; 1 red onion (thinly sliced)