Take your sourdough from adequate to artisan with these tools of the trade. Words: Nadene Hall Images: William Chun, Neville Chun A cup of soup is a comforting treat for kids. When Neville Chun’s children started having a cup at pre-school each Wednesday, he thought he’d bake a loaf of sourdough to go with it. Things quickly snowballed. The teacher asked if he’d made her a loaf. Then two. Then three. The parents got wind of it. Neville bought a bigger oven. Fifteen years later, he bakes 75 loaves of bread a week for a local organic store in his