This is a quick, simple soup. I used a Japanese vegetable broth; soy sauce and sesame oil are added for richness and flavor, but the broth on its own isn’t very substantial. The perfect addition to this is smoked trout – Trader Joe’s sells it in little tins, which makes it easy to transport as a work lunch.

• Soba Noodle Soup with Spinach & Smoked Trout (Serious Eats)