Each dish on the table should have its own serving spoon. A personal spoon that has been in someone's mouth carries bacteria and food residue into the shared dish, and moving a serving spoon from one dish to another mixes their flavors and ingredients. The spoon used for yogurt should not go into the sauce, and the spoon from a meat dish should not go into a meat-free dish. This practice keeps the dishes clean and protects the plate of a guest who eats meat-free or has an allergy.
Putting a personal spoon into a shared dish is one of the most common and least noticed habits at the table. A spoon that has been in someone’s mouth carries bacteria and saliva into the dish. Saliva also contains an enzyme that breaks down starch; that is why a spoon from someone’s mouth can make part of a starchy dish such as rice, mashed potatoes, or pudding watery after a while. Keeping a personal spoon out of the shared dish protects the food before it is a matter of etiquette. Each person serves their portion onto their plate with the serving spoon and eats with their own spoon.
The second reason each dish should have its own spoon is flavor. When the spoon from tzatziki goes into tomato sauce, or tongs from fried food go into dessert, each dish picks up a bit of the other. A yogurt-based dish gets a streak of red sauce, and salad dressing ends up in the rice. The longer the dishes stay on the table, the more these flavors mix, so the last portions taste different from the first. That is why each serving dish gets its own spoon. Keep the spoon in the dish or on a small rest beside it; a spoon left on the tablecloth can stain it and may be returned to the wrong dish.
The third reason is ingredients, which can be decisive for some guests. If the spoon used for a meat dish goes into a meat-free dish, that dish is no longer meat-free. The same applies when the spoon used for a hazelnut or walnut dessert goes into another dessert. Dishes meant for a guest who avoids meat or has an allergy should be served with separate spoons and placed a little apart from the others. A separate spoon reduces cross-contact but is not enough on its own; for a guest with a severe allergy, prepare their food separately and keep it covered. It also helps to choose a different-looking spoon for each dish so it is immediately clear which spoon belongs where.
A few habits are enough in practice. Count the serving spoons along with the dishes when setting the table: however many dishes there are, set out that many spoons. Point each spoon’s handle out of the dish toward the person serving themselves so their hand does not get food on it. Use a ladle for saucy dishes, tongs or 2 spoons for salad, and tongs for bread. If a spoon falls into a dish, do not retrieve it by hand; remove it with a clean spoon. Bring the serving spoon and knife for dessert and fruit out with those dishes, keeping them separate from the utensils for the main course.
Keeping the serving spoon separate also matters after the meal. Leftovers from a dish touched by a personal spoon are not the same as leftovers from an untouched dish and spoil sooner; how long leftovers can be stored is a separate question. A dish served with a shared spoon but not touched by a personal spoon is therefore better protected. Instead of bringing the whole pot to the table, transfer only as much as will be eaten to the serving dish. The portion that stays off the table remains untouched and can be set aside for the next day. Refrigerate that portion within 2 hours of cooking.