Lettuce Pot

I purchased some nice lettuce transplants a month ago and planted a Lettuce Pot.  It is on my back porch where I can go and snip at will.  Supposedly there is a tomato plant in the middle.  Don't know if it will survive.  I also planted some Nasturtium flowers.  Did you know you can eat the flower and the leaves?  They taste a little spicy like radish.