Spanish Roast Chicken with Romesco and Grilled Onions Recipe

Name: Spanish Roast Chicken with Romesco and Grilled Onions Recipe
Ingredients: For the Chicken:; 1 large chicken (4 to 5 pounds); 2 teaspoons hot smoked paprika (see note above); Kosher salt and freshly ground black pepper; 2 tablespoons olive oil; 1/4 cup juice from 1 orange; 8 medium cloves garlic; For the Romesco:; 3 tablespoons slivered almonds, toasted; 7 hazelnuts, toasted, with loose skins removed while warm; 1 slice stale bread, roughly torn; 1/2 cup roasted red peppers, drained; 1 1/4 cup fire-roasted tomatoes (from a 14-ounce can), drained; 1/4 cup sherry vinegar; 1/4 tsp red pepper flakes; 1/2 cup extra virgin olive oil; For the Onions:; 12 gree onions or scallions, trimmed.; 2 teaspoons olive oil