Rhubarb Apple Pie

Name: Rhubarb Apple Pie
Prep time: 15 min
Cook time: 55 min
Total time: 1 h 10 min
Yield: 1
Ingredients: 1 Apple; 1 lb Rhubarb; 1 Egg, large; 3/4 cup Brown sugar, light or dark; 2 tbsp Corn starch; 1 Ice cream or whipped cream; 1/4 tsp Sea salt, fine-grain; 1/2 Vanilla bean; 1 tablespoon turbinado sugar or demarrara