Are you a very cheerful and colorful person? Well, this recipe is super easy to make with your kids as a weekend activity. The following recipe is a rainbow cake roll. It sounds strange but it's really good and don't worry if you are on a diet, it won't hurt you one day. Now let's stop talking and start with the ingredients. Now your ingredients are super easy to get and inexpensive. You will need five egg yolks, 2/3 cup granulated sugar and be sure to divide it into 1/3 cup portions, 1 teaspoon lemon juice, ½ teaspoon finely grated lemon zest, five egg whites, 2/ 3 cup cake flour, ¼ teaspoon salt, 1 teaspoon baking soda and last but not least, 3 tablespoons melted butter. First we will prepare our batter. Separate the yolks from the whites. Beat the egg yolks until they become slightly lighter and the consistency thickens. While whisking the egg yolks, add 1/3 cup granulated sugar, lemon zest, and lemon juice. Don't worry, your cake won't taste like lemon, it's just to pick up the flavor of the egg. Now, ...