I don't mean you can get ready sliced tomatoes off a plant :0) that would be silly. However, rather than pay for an expensive pack of seeds, or go to the trouble of picking seeds out of a tomato and drying them, you can actually plant slices of tomatoes. It's so easy to do. Simply lay them out, cover with compost and keep them watered.
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Stick a slice of tomato 1/2 inch in the ground and walk away. No need for anything fancy. The seeds sprout. You thin them out. The slice feeds the couple you keep. You just provide the water, and later, some Epsom salt and whatever else you want to use for food. Plant a marigold nearby to ward off bad bugs and attract ladybugs.