If you can’t find baby turnips, simply cut a regular turnip into 1/2-inch cubes.
Similar to leeks, bok choy can be gritty. If you notice any dirt that’s snuck between the base of the leaves, add the whole lot of sliced choy to a bowl of water. Agitate with your hands so that any dirt falls to the bottom. Then lift the greens out with your hands (don’t drain through a colander!) and pat dry with a dish towel.