The first step is to choose your best looking tomatoes. You want to save seed from the finest fruit, so that next year’s plant will have good genes. Many plant seeds can be saved simply by collecting them as they dry. Tomatoes take a bit more work. If you have glass jars available, they make a good container for fermenting tomato seeds. Covering the top of the jar with cheesecloth or paper towel will keep fruit flies out and also diminish the spread of the unpleasant odor. Click to see the Infographic of Saving Seeds!