Garlic Maple Butter Roast Chicken

Name: Garlic Maple Butter Roast Chicken
Cuisine: American
Ingredients: 1 stick (113g) unsalted butter (at room temperature); 1 lemon; 10 cloves garlic, roughly chopped; 3 sprigs fresh rosemary (leaves removed); 1/4 cup (85g) maple syrup; Crushed red pepper flakes to taste; Freshly cracked black pepper; Kosher salt; 1 raw whole chicken, giblets removed and pat dry with a paper towel