Aldi sells two types of pesto: Pesto alla Genovese and Pesto Rosso. The traditional classic basil flavored pesto is Pesto all Genovese, which is green in color. Pesto Rosso is a sun-dried tomato pesto and is red. This recipe would work with either variety, but I prefer to make it with Pesto all Genovese.
If you can't find the pre-sliced fresh mozzarella log, you could also purchase a fresh mozzarella ball and cut it into ¼" slices.