If you are using a larger slicing tomato, cut it into small, bite-sized chunks.
Slice the cucumber in half lengthwise then lay the halves cut-side down and slice them crosswise into thin, half-moon pieces.
Stand the bell pepper upright and slice down all four sides, cutting away from the core. Take the large, flat pieces of pepper and slice them into thin strips.
Use a sharp knife or a mandolin to slice the radishes into very thin rounds.
Slice the white and light green parts of the spring onions thinly.
Use a sharp knife to finely chop the dill.
Tear or chop the leaves into bite-sized pieces and place them in your largest mixing bowl.
Add the prepared vegetables on top of the chopped lettuce in your mixing bowl.
Sprinkle the finely chopped fresh dill over all the vegetables. Give the entire mixture a gentle toss to distribute the ingredients evenly.
Season with salt and freshly ground black pepper. Pour in the white wine vinegar and the olive oil, and scoop in the Greek yogurt.
Using two large spoons, gently toss the salad until every piece of vegetable and lettuce is evenly coated in the rich, creamy dressing.
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Notes
The single most important tip for achieving the best possible creamy Greek yogurt salad is often overlooked: Ensure All Vegetables Are Bone Dry Before Dressing.If you plan to use this salad for lunch throughout the week, keep the creamy Greek yogurt dressing separate from the chopped vegetables.You can easily substitute the white wine vinegar with fresh lemon juice for a zesty, bright flavor.