Cook the barley according to the packaging instructions.
In a large skillet, heat the oils over medium-high heat.
Add the diced onion, zucchini, squash and bell pepper to the pan. Season with salt and cook through. (This should take 5-10 minutes, depending on your stove.)
Once vegetables are soft, crack the two eggs in the skillet, breaking up immediately with your spatula/wooden spoon, and cooking until the egg is completely cooked. Season with pepper.
Add the cooked barley, mixing in with the vegetables and egg. Lower the heat to medium-low.
Once everything is combined, pour in the soy sauce slowly, stirring until mixed in, then remove the pan from the heat.
Top with toasted sesame seeds, season more with pepper (if need be) and serve warm.