I started eating a bag of frozen brocolli each night (nuked) and after several nights in a row, what has resulted are symptoms of a testosterone boost (I'll leave those to your imagination, but you know what I'm talking about) that FAR outweigh anything tribulus has done for me.
After doing some research, here is what I came up with as far as the connection between broccoli and testosterone .
From "A Man's Worse Nightmare Health Alert 125" by Al Sears, MD.-- http://www.alsearsmd.com/ha125.php
"I3C (Indole-3-Carbinol) is a plant compound that has the ability to rid estrogen from your body.3 Vegetables like cabbage, Brussels sprouts, and broccoli contain it. In your digestive tract, I3C converts into DIM.
DIM (Diindolylmethane) is a plant compound that enhances estrogen elimination. It breaks down estrogen into safer compounds. DIM balances the testosterone-estrogen ratio."
Other sources have also contained similar references. As such, I plan on making sure that my diet includes at least one Indole-containing vegetable in significant quantities each day (although I don't know if I could stomach the cabbage!).