Halve the cherry tomatoes and place in a bowl.
Slice the onion into very thin rings or slices and sprinkle over the tomatoes.
Season to taste with salt and pepper, add olive oil, and gently stir to combine.
Add basil leaves and stir again. Taste and adjust seasoning as desired.
Serve immediately or up to 3 hours after preparation.
Cherry Tomato Salad with Basil Recipe: https://whatscookingamerica.net/salad/cherrytomatosalad2.htm