ABOUT THIS RECIPEHeat, acidity and a crisp bite
Little gem is sturdy enough to cook briefly without going limp straight away. The cut sides turn dark and take on a lightly bitter, toasted flavor, while the hearts stay cool and crisp. That contrast is exactly what you want: cook the lettuce briefly in a properly hot pan. A pan that isn’t hot enough will make the heads release moisture before they brown. Work in batches if needed, so the cut sides stay in contact with the pan.
Anchovy adds saltiness and umami to the dressing, but it doesn’t need to stand out as distinct fish fillets. Mash the fillets with the mustard and lemon juice before whisking in the oil; this helps distribute them evenly. Taste only after that, and add salt only if needed. The amount of lemon balances the rich oil and savory anchovy. Add a spoonful of water if the dressing is too thick to drizzle over the lettuce.
Rye bread makes the topping nuttier and earthier than regular bread croutons. Crumble it coarsely: small crumbs turn hard quickly and brown sooner, while larger pieces stay crisp with a bit of bite. Stale bread works perfectly for this. No rye bread on hand? Use sturdy sourdough bread; the flavor will be milder, but the crisp texture will remain. Toast the crumbs separately and keep them dry until serving, so they don’t soften from the dressing.
Little gem is generally available year-round; choose heads with fresh, firm leaves and a base that hasn’t dried out. Rinse them if needed and dry them thoroughly, since wet lettuce doesn’t sear as well. Serve this dish straight away as a side with pan-fried fish, chicken or a meal with legumes. For a vegetarian version, replace the anchovy with finely chopped capers and a little miso; taste the dressing carefully, since miso is salty too. Add the dressing and crumbs at the table if you want to keep the lettuce crisp for as long as possible.