PICNIC SALADS Both of these salads travel excellently, so I have called them picnic salads, which indeed they are, but they also do well at home for buffet suppers. POTATO SALAD As you will see, the secret here, as in the seafood salads, is to mari- nate the potatoes in (store-bought) French dressing. Why this should be a little-known secret, I don't know, but it is a pity that more people are not aware of it, for it is the French dressing in all these salads that keeps them from being bland and flat. BECIPE: POTATO SALAD cooked or canned potatoes 1 sliced onion 1. Freshly boiled potatoes, to which the French dressing is added while they are still hot, absorb the dressing best, but canned potatoes will do almost as well. Slice the potatoes into a bowl. Slice an onion and break the slices into rings by pressing in the center of each slice. Add to the potatoes, and salt and pepper both well. Pour bottled French dressing liberally over. Stir so that the potatoes and onions are well-coated, cover the bowl, and put it in the refrigerator. Actually, the salad will be best if you can do this much the day be- fore and it can stay in the refrigerator overnight. 2. When ready to make the salad, pour off most of the French dressing, add liberal quantities of mayonnaise, mix, and that's all. If you are taking the salad on a picnic, put it in a jar with a screw- top lid. If it is for a buffet supper, line the salad bowl with lettuce leaves, mound the potato salad in the middle, put a tablespoon of mayonnaise on top and sprinkle it with paprika, and tuck around the salad celery and carrot sticks and green and ripe olives.