Shrimp on Toast with Capers, Dill, and Chervil

There’s something lovely and a little ridiculous about having a giant, open-faced shrimp sandwich, casual as chicken salad, like the one I had at Rochelle Canteen in the spring of 2019. It was piled high with the small brown shrimp that are very popular in London, tossed in a creamy dressing riddled with herbs. Sourcing the same brown shrimp is difficult in the States, so you either must go big—standard cocktail size—or get some tiny bay shrimp (I get mine from Oregon). They are a little sw