Mixed Vegetable Gratin from Cooking and Cooking
Yield: Serves 5-6

Wash the potatoes, put them into a pot and add salt. Pour water until potatoes are covered and bring to a boil. Reduce heat to medium. Cover the pot and simmer until done - a fork can easily be poked through them. Drain water from potatoes, peel and slice them into 3/4 inch slices. Set aside.

Heat oil in a pot over medium heat. Add the mushrooms and saute for 12-15 minutes, stirring occasionally. Add the green pepper and zucchini; saute for 5 minutes. Add pesto sauce, salt and pepper. Cook uncovered until vegetables are tender and almost all liquid is absorbed. Taste and adjust seasonings.

Meanwhile prepare the White Sauce or Bechemal Sauce (if it looks too thick, add a little more milk). Set the sauce aside.

Use a little oil to grease a 8 x 11-inch baking dish. Put a layer of sliced potatoes down first. Then spread the vegetable mixture over the potatoes. Pour the white sauce all over the vegetable mixture.

Then sprinkle cheese on top.

Place the baking dish on the middle rack of the oven. Broil on low heat until cheese is melted and the top begins to get lightly browned, about 3-5 minutes (watch carefully while broiling). Remove from the oven and let cool for a few minutes before serving.

Source: www.cookingandcooking.com