Below are tomato seeds saved from an heirloom variety. Harvest the first fruit to mature as long as it is of superior quality so you will be progressively bettering the variety. I like to write the date on the paper towel so I know when it matured.
This is the way I save my Heirloom tomato seeds.
I will just have to wait and see what kind they are!
To plant, tear of a section of the paper towel, plant the towel and seeds under 1/4 inch of soil. The paper towel will dissolve. Transplant tomato seedlings into individual containers or pots when they are about 1-2 inches tall.
I harvest winter squash in the same manner.
When I harvest seeds from lettuce, spinach, arugula, or other greens I allow the plants that are the slowest to bolt to go to seed and harvest them. This helps establish plants that will preform for longer periods of time.
gather seeds from lettuce when the tops of the blossoms are dry and fluffy