Vegetable Tempura

Name: Vegetable Tempura
Prep time: 5 min
Cook time: 25 min
Total time: 30 min
Cuisine: Japanese
Ingredients: 1 cup flour (I used whole wheat flour); 2 tbsp cornstarch; 1 tbsp baking powder; 1/2 tsp salt; 1 cup sparkling water; 2 cups oil (see notes); 1 large carrot (sliced); 1/2 large red bell pepper (julienned); 1/2 large head of broccoli (chopped, discard the stem); 1/2 large zucchini (julienned); 1 cup vegetable stock or water; 1/4 cup soy sauce or tamari; 1/4 cup mirin (see notes); 2 tbsp maple syrup