Preheat oven to 350°F (180°C). Toss bread cubes in olive oil. Place on a baking sheet. Toast bread, stirring occasionally, until golden brown (about 10 minutes). Let cool. Whisk vinaigrette ingredients together in a bowl until emulsified. Season to taste.In a large bowl, combine bread cubes, tomatoes, cucumber, yellow pepper, red onion and basil. Add vinaigrette and toss well. Season with lots of salt and pepper. Let sit for at least 30 minutes before serving so the bread can soak up all the juices.
Serve in Chinese takeout boxes with bright-colored chopsticks.