Gazpacho Salad with Croutons

Place onion in a small bowl of ice water. Let stand 10 minutes, then drain and pat dry.

Using a Microplane, finely grate garlic into a small bowl. Whisk in Dijon and vinegar. Slowly drizzle in oil in a steady stream, whisking until emulsified. Season with salt and pepper.

Arrange tomatoes, pepper, cucumber, and onion on a platter. Toast bread, then cut into 1/2-inch cubes and sprinkle over salad. Season with salt and pepper and drizzle with vinaigrette; serve.