One thing we always discuss in our workshops is the importance of layering flavors. If a recipe calls for lemon, can you layer in zest and add the juice? Can you finish the dish with some chopped preserved lemon? Layering varieties of the same flavor deepen the overall taste. It's what takes a dish from simple to complex-tasting, even if the technique itself is simple. So when we decided to start our January Bread Subscription with a seeded sourdough loaf that included fennel seeds, we immediately thought of this fennel tomato soup, adapted from The River Cafe in London. The fennel flavor...