Potatoes are a great place to start. They maximize calories for grow space -- and are nutritive enough -- to move the needle for community food security.
• 5 gallon container, filled halfway with good soil
• organic potatoes with eyes -- brown ones will store longer than red/yellow
• when potato greens peek out of container, gently fill rest of container with soil. this is called "hilling"
• when the plant yellows, you are ready to harvest your potatoes!