In a large pot, boil water and add a few drops of canola oil. Prepare noodles according to directions on package. Drain noodles and cool. Clean and cut rhubarb into ¼ inch diagnal pieces. Using a medium frying pan, melt 2 tablespoon of butter over medium low flame. Sauté the apples, cherries and rhubarb in butter, sprinkling pumpkin spice and 1 tablespoon sugar over the fruit. Stir until fruit is tender, about 4-7 minutes. Cool to room temperature. Spray a 9 X 13-inch baking dish with non stick spray. Preheat oven to 350°. In a large mixing bowl, beat eggs until light and fluffy. Add the ricotta cheese, sour cream, 1/2 cup sugar and lemon zest, beating until well-combined. Gently stir in the noodles and fruit. Pour the mixture into the prepared baking dish. Sprinkle the crushed Frosted Flakes over kugel, and bake 30-40 minutes, when kugel bubbles and top browns. Cut into squares. Serve immediately, or cool to room temperature, refrigerate and reheat until warmed through.