Tuscany — the tradition is documented from at least the 16th century in Boccaccio and Bronzino. A summer dish of the Tuscan contadino using the combination of the region's staple (unsalted bread) and the summer tomato harvest.
Panzanella is a summer salad of stale, water-soaked and squeezed unsalted Tuscan bread, torn into chunks and dressed with ripe tomatoes, cucumber, raw red onion, fresh basil, olive oil, and red wine vinegar. The bread absorbs the tomato juices and dressing and becomes a textural hybrid — not crisp, not wet, but dense and chewy, simultaneously a crouton and a vehicle for the dressing. The ratio of tomato to bread and the quality of both determine everything. This is not a recipe for stale bread disposal — it is a specific dish with specific requirements.
Perfectly made panzanella has a texture unlike any other salad — the bread is dense and chewy with a slightly acidic tang from the vinegar it has absorbed. The ripe tomato provides sweetness and juice; the basil gives fragrance. The Tuscan oil adds bitter-pepper complexity. In season, this is one of the most satisfying salads in Italian cooking.
The bread must be pane sciocco (Tuscan unsalted bread) that is at least 2 days old and stale. Soak in cold water for 3-5 minutes until saturated, then squeeze firmly — very firmly — until almost dry. Tear into rough chunks. The tomatoes should be ripe to the point of bursting — they are the dressing, not a garnish. Dress with excellent Tuscan extra-virgin oil, red wine vinegar, and salt. Toss to combine and rest 20 minutes before serving — the bread absorbs the tomato juices and the flavours integrate.
The brief resting time (20-30 minutes at room temperature) is non-negotiable. If the tomatoes are particularly juicy, taste before adding vinegar — the acidity from ripe tomatoes may be sufficient. Serve at room temperature, not from the refrigerator — cold kills the flavour. Cucumber adds freshness and crunch; red onion adds bite — both can be adjusted to taste, but the bread and tomato are fixed.
Using fresh bread — it disintegrates into paste. Using salted bread — disrupts seasoning balance. Inadequately squeezing the soaked bread — the salad becomes waterlogged. Not resting before serving — the flavours are separate and the bread hasn't absorbed the tomato. Using out-of-season tomatoes — panzanella is a July-August dish; winter tomatoes produce a flat, acidic result.
Marcella Hazan, Essentials of Classic Italian Cooking; Julia della Croce, Pasta Classica