Vegetable Tempura

Name: Vegetable Tempura
Prep time: 5 min
Cook time: 25 min
Total time: 30 min
Cuisine: Japanese
Ingredients: 1 cup flour (120 g), I used whole wheat flour; 2 tbsp cornstarch; 1 tbsp baking powder; 1/2 tsp salt; 1 cup sparkling water (250 ml); 2 cups oil (500 ml), 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 (250 ml); 1/4 cup soy sauce or tamari (65 ml or 4 tbsp); 1/4 cup mirin (65 ml or 4 tbsp), see notes; 2 tbsp maple syrup