Mussels with Stewed Leeks and Garlicky Broth on Toast

Quickly steamed-open mussels on toast can make a great impromptu meal ... one that can be assembled quickly with a little foresight, as well. The only real “do ahead” task would be to have some fish stock on hand. Beyond that, this is a one-pot deal. If you don’t have any fish stock in your freezer, check with your seafood purveyor, as many tend to make stock of their own with the leftover bones they have from butchery. And if you’re planning ahead, make s