In a small bowl, combine the dressing ingredients, and whisk together
In a large skillet over medium heat add 1 tsp. of the oil, and corn
Cook until browned
In a small bowl, mix the mustard powder, garlic powder, pepper, and salt
Coat the shrimp with spices
Add the rest of the oil to the skillet, and then add the shrimp
Squeeze the lemon over the shrimp, cook for 1-2 minutes
Add the tomato halves, and nectarine slices - continue to cook for a couple of minutes or until shrimp turns pink
In a large bowl add the lettuce and sliced onion
Add the cooked ingredients, and the salad dressing
Toss to coat
Sprinkle Feta Cheese on top, and serve