In a large bowl, add bell peppers, cucumbers, tomatoes and red onion.
Drizzle with olive oil and sprinkle with salt and pepper.
Stir gently from the bottom of the bowl in the center until well combined. Let salad chill in refrigerator for 10 minutes (don't skip!). Then taste and adjust any seasonings to taste, if you wish.
Salad tastes best when served immediately.
Notes
Store: Refrigerate salad for up to 24 hours.
Make ahead: Refrigerate all vegetables in a bowl covered. Then add oil, salt and pepper right before serving.
Best tomatoes to use: In summer heirloom varieties, Roma tomatoes. Year-round we love tomatoes on the vine.
Other additions to taste: Fresh dill or parsley, grated garlic clove, white vinegar, a touch of toasted sesame oil.