Third Coast Salad

I've copied the ingredients of the house salad at Third Coast Grille restaurant. I'm not sure they use onion, but I like it. I should use a purple onion next time for the color...

THIRD COAST SALAD

lettuce of your choice (Romaine is good)
chopped Roma tomatoes
diced cucumber
thinly sliced onion
mandarin orange slices, drained
sunflower seeds
poppy seed dressing

Mix ingredients in the portions and proportions desired.