Maple Walnut Swirl Ice Cream

Name: Maple Walnut Swirl Ice Cream
Prep time: 15 min
Cook time: 12 h 30 min
Total time: 12 h 30 min
Yield: 10 portions
Ingredients: 120 g walnuts, shelled; 430 g heavy whipping cream, 30-40% fat; 370 g evaporated milk; 45 g maple syrup; 270 g dark brown sugar; 50 g corn syrup, light; 5 egg yolks; 85 g maple syrup, pure; 115 g butter, unsalted; 1 pinch salt; 1 tsp lemon juice; 5 g vanilla extract, natural; walnuts, chopped