Quick soy-steeped spinach

If there is a single dish from this book that makes the most regular appearance on our dining table, it’s this one. We will often cook a bunch of spinach early in the week and just leave it in the fridge. We have boosted soy sauce always to hand and the bonito flakes live in the pantry. From that starting point, if we need an extra dish for the table, this can be ready in less than a minute.