Simmer

You can use this recipe to make spinach gnocchi: Thaw 1 10-ounce package frozen spinach, very finely chop the leaves, and squeeze out the moisture. Add it to the potatoes in the bowl, and sprinkle with an additional 2 tablespoons flour. Formed gnocchi can be refrigerated on a floured baking sheet, uncovered, up to 12 hours.

If you have trouble finding caciocavallo cheese, you can substitute grated Parmigiano-Reggiano.

The pesto can be made up to 1 hour before serving without losing its freshness; store it at room temperature.

Tangy homemade pickles and onions bring intense flavor and satisfying heft to these sandwiches. However, you can omit step 1 and use jarred pickles; just do keep in mind that these may increase your sodium intake.

To julienne the vegetables, cut them into thin matchstick-size pieces using a sharp knife or a mandoline. Refrigerate them in an airtight container until ready to use, up to 3 hours.

The lentils can be made up to a day in advance and the salad assembled at the last minute. Poached or grilled chicken breast would produce equally appetizing results.

Although fresh mackerel can be hard to find, smoked mackerel is often sold in the refrigerated section of supermarkets; it is also available from mail-order sources. We used the peppered variety, but any type will do.