All fruits and vegetables are kosher. All unprocessed grains and cereals are kosher. Eggs are kosher. Fish with scales and fins are kosher. Gelatin is kosher according to standards of the Conservative Movement.
Any food bearing a hekhsher is kosher.
See pages 72 - 73 of The Jewish Dietary Laws for common hekhshers . Note that dairy products may be marked with a 'D' in addition to the hekhsher , and that meat products may bear an 'M' in addition to the hekhsher . Pareve foods may be marked 'parve'. Foods marked with a 'P' are kosher for Passover. If it contains meat or a meat derivative it is not kosher.