Dice all the vegetables into similar-sized, small cubes (if you have a vegetable dices, it will come in handy). Dice the tomatoes into quarters. Dice the crab meat into similar-sized pieces as the veggies.
In a small bowl, whisk the mayonnaise, garlic, and lemon juice together.
Add the dressing to the veggies and stir to combine. Season to taste. Serve fresh and crispy!