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			No, it's not a strict formula. It's more like composing a picture. 
 
Also it depends on what the salad is for. I usually eat salad for dinner, so I usually start with 2 cups of greens per person & then add a little bit each of the other ingredients. But I had this nice first-course salad at a restaurant & it was two slices of tomato, a few olives, a goat-cheese fritter, and a garnish of baby spinach in vinaigrette. 
 
Grilled Chicken & Nectarine Salad 
greens - mesclun 
vinaigrette - raspberry vinaigrette 
protein - grilled chicken, toasted walnuts 
fruit - sliced nectarines & a few raspberries 
vegetable - none			 |   
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