Preheat oven to 400 degrees. Place the bacon on a cookie sheet and and bake for 10 minutes then turn baconover and cook another 5 minutes or until crisp. Drain reserving 2 Tablespoons of bacon fat. Add the bacon fat to a large sauce pan with 2 Cups of water. Bring to a boil. Add couscous, put the lid on it and remove from heat. Let sit for 5 minutes.
Meanwhile, crumble the bacon into a large bowl and add the lettuce, tomato, onion, and cucumbers. In a small bowl, mix, lemon juice, lemon zest, salt and pepper. Toss everything together. This salad holds up well in the heat.
Line cocktail glasses with slices of lemon and serve the couscous in the glasses.