There's nothing to this salad, other than taking a little care in the presentation. No cooking involved, it makes any table look great and the least competent cook look like they might know what they're doing!
The beauty about salad, and vegetables in general is that they're quick and easy to prepare, and the colours are amazing!
Taking simple ingredients below, and combining with few additions gives you tons of flavour and visual impact for very little skill and effort.
No need for portion sizes here
Herbes de Provence
Hand-harvested sea salt (the Portuguese Algarvean salt is wonderful, and full of minerals not found in table salt)
Some olive oil and white wine vinegar complements the onion and tomoto wonderfully.
You can can add whatever you like to this simple piece. Sprinkle some parsley or coriander leaves over the plate to add another little bit of colour and taste