The trick to assembling good sandwiches, especially those that involve tomatoes, is to avoid soggy bread. This one has been known to hold steady for more than 12 hours at a time given its construction.

1 (6-inch) piece of baguette

2 tablespoons pesto

2-3 ounces shredded chicken

1 handful young spinach leaves

1 small tomato, sliced

3 thin slices fresh mozzarella

Black pepper

Syrupy balsamic vinegar

Slice the baguette in half lengthwise. On 1 side, slather the pesto and top with chicken. On the other, scatter the spinach leaves. Top leaves with tomatoes, cheese, a few turns of cracked black pepper and a slight drizzle of vinegar. Close the sandwich. Give it a good pressing with your hands. Wrap it tightly in parchment paper. If the cheese, tomato or vinegar runs out, the paper will absorb it to keep the bread from getting soggy.