Ugh, bugs

We've had four tomatoes from the garden so far. Very exciting as we usually don't get any until July! The herbs are growing very well. The problem is the lettuce.
Yesterday I went out and cut some for a salad with dinner. Into the salad spinner for a soak and YUCK. Thousands upon thousands of little green bugs. Aphids I suspect. After three soaks and a couple very thorough rinsings I was still seeing little bugs. Darn things are everywhere. We had spinach salad instead ;-)
Should I just dig it up and chalk it up to a lesson learned? Any suggestions for growing lettuce with fewer bugs in the future?
The bugs aren't on anything else in the garden that I could see. But boy they love that lettuce.
thanks marcella
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I had 2 nice juicy ripe tomatos for tea tonight. Nothing much to get excited about you may say except that I live in New Zealand and we are in the throes of winter here. Going to get down to zero tonight so will have a frost. The 3 tomato plants in my (unheated) polytunnel are still producing fruit, though they have had whats looks like late blight hit them recently. I keep wondering when they will give up yet they are still trucking on.
rob
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