Rainbow Pasta. The kids will love this as a birthday treat ! Place your pasta in boiling water that has a tablespoon or so of olive oil in it. Boil it for 4 minutes LESS than the time recommended on the box for al dente pasta. Then strain it and place it in a large bowl or Ziplock bag that contains just enough cool water and food coloring of your choice. Leave it in the bag until it reaches the desired depth of color and then rinse it before serving.