Place all dressing ingredients in a small - to medium-sized mixing bowl. Whisk to combine. Add the cucumber and the tomato, and gently stir to coat the vegetables with dressing. Allow this mixture to sit, marinating the vegetables a bit, while preparing the rest of the salad.
Combine spinach, garbanzo beans and tuna in a very large salad bowl. Add the dressing and veggie mixture and toss thoroughly but gently to combine.
Estimated cost per serving: $2.50
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