To make the mixed vegetables: In a kettle of boiling salted water cook separately the zucchini, the pattypan squash, the carrots, and the haricots verts until each vegetable is crisp-tende r and cook the potato, peeled and cut into 1/2-inch dice, until it is cooked th rough, transferring the vegetables as they are cooked with a slotted spoon to a bowl of ice and cold water to stop the cooking. Drain the vegetables and pat them dry. The vegetables may be prepared up to this point 1 day in advance and kept covered and chilled.
In a large skillet heat the oil over moderately high heat until it is hot but n ot smoking and in it saute the zucchini, the pattypan squash, the carrots, the haricots verts, and the onions for 3 minutes, or until they are heated through. Stir in the potato, the herbs, and salt and pepper to taste and saute the mix ture for 1 minute.
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