At Passover we remember our redemption from Egypt by eating matzo, bitter herbs, roast meats, chicken matzo ball soup and other Jewish delicacies. At Hanukkah we remember the victory over Antiochus Epiphanes and we eat potato latkes or donuts cooked in oil to remind us of the miracle of oil. On Purim we eat Hamantashen or Haman's hats," which is a pastry filled with sweet prunes or a combination of honey and poppy seed. So you can understand why some joke that the meaning of these holidays is all wrapped up in one sentence:
"They tried to kill us; we won; let's eat!"