Crispy Tempura Zucchini / Courgette

Ingredients 4½ oz Flour 4½ oz Cornstarch 10 fluid oz Very cold soda water pinch of salt ¼ inch slices Zucchini/Courgette There's enough batter to coat about 2lbs of Zucchini/Courgette Vegetable/Sunflower Oil 200/220c - 390/430f Wok or Deep Pot for frying