1/2 small red onion, thinly sliced
2 anchovy fillets
2 tablespoons extra-virgin olive oil
2 cloves garlic, grated
Kosher salt and freshly ground pepper
Kosher salt and freshly ground pepper
2 large slices sourdough bread, crusts trimmed, torn into bite-size pieces
1/3 cup buttermilk
1/4 cup sour cream
2 tablespoons crumbled blue cheese (about 1 ounce)
2 teaspoons apple cider vinegar
1 tablespoon chopped fresh parsley
8 cups baby spinach (about 5 ounces)
1 small head red-leaf lettuce, torn (about 6 cups)
1/2 English cucumber, thinly sliced