This is a wonderful no oil, no nut based dressing, and oh, so simple to make. I found it at http://tastespace.wordpress.com/2011/08/21/3-2-1-super-simple-salad-dressing/
3 tbs Balsamic Vinegar
2 tbs Dijon Mustard
1 tbs Maple Syrup or 2 Medjool Dates (Large Dates)
Place all ingredients into Thermomix or high powered blender and blend at high speed for 30 seconds.
I place my Lettuce Mix in a plastic bag with a good quantity of Dressing and manoeuvre it around until the leaves are evenly coated.
Then add sliced mushrooms, tomatoes, radishes and Avocado and anything else that takes my fancy. Just beautiful.