CONFESSIONS OF AN ONION-GROWEREverything in life starts with an idea. Something crosses your mind, vagrant and casual maybe as a little back-fire of wind that stirs the hollyhocks outside your window. If you entertain the thought for a moment it seems to leave a deposit in your brain cells which makes it easy for the thought to come again. The thought of growing onions has been in my mind off and on for years, beginning I think at a time when I discovered I had no onion and wanted to make a potato salad. We all like to dream of what we will do, when we are released from care and worry. Many of my friends have chosen chickens as their insurance against the boredom of retirement. Chickens are very chatty and companionable, resourceful and dependable, but I was janitor and mother's-help to t