You could head to the grocery every time you need a new head—or you could grow lettuce straight from your kitchen. Go ahead and eat your store-bought batch, but leave the central part of the vegetable untouched, since this section possesses the power for producing new growth. Cut the leaves about an inch from the bottom of the lettuce bunch.Place the lettuce stem in a shallow dish of water. Change the water every couple of days; after 10 to 12 days, you’ll have new leaves growing from the center of the stem. This tender lettuce is perfect for making small salads or topping sandwiches.