2. If using a country loaf, pull out some soft interior crumb to form a cavity. If using a ciabatta, you won’t need to eliminate anything.
3. If using a Kirby cucumber, slice thinly. If using a regular cucumber, peel, halve lengthwise, and scoop out seeds from one half. Thinly slice seedless half. Add sliced cucumber to vinaigrette and toss well.
4. Spread half the cucumbers on bottom of bread. Top with tomato and onion slices, then with tuna, basil, olives and egg slices. Top egg with remaining cucumbers and vinaigrette. Cover with second bread half and firmly press sandwich together.
5. Wrap sandwich tightly in foil, waxed paper or plastic wrap, then place in a plastic bag. Put sandwich under a weight such as a cast-iron frying pan topped with a filled kettle, or have a child about 7 years old sit on it. Weight sandwich for 7 to 10 minutes, then flip and weight it for another 7 to 10 minutes (or as long as you can get the child to sit still). Unwrap, slice and serve immediately, or keep it wrapped for up to 8 hours before serving.
Reprinted from A Good Appetite: Lunch Recipe: Take One 7-Year-Old by Melissa Clark.
Andrea Reusing is the creator of the restaurant Lantern in Chapel Hill, N.C., and author of the book Cooking in the Moment: A Year of Seasonal Recipes. In this installment of The Key 3, she shares with Lynne Rossetto Kasper the techniques behind three of her favorite recipes: Turnip Soup, Overnight Braised Short Ribs and Tomato Salad.