1. First, mix together all dressing ingredients in a small bowl.

2. Let sit for at least a 30 minutes.

3. Next, bring about 4-6 cups of water to a boil in a large saucepan and add the potatoes. Bring back to a boil, and boil for 4-5 minutes. Do not overcook! You don't want them to be hard, but you don't want them to be mushy, either.

4. Drain the potatoes, and rinse well under cold water.

5. Drain the garbanzo beans and rinse them thoroughly under cold water.

6. Mix together, the tomatoes, spinach, garbanzo beans and cooled potatoes. Add the dressing and toss well to coat.

7. Cover the bowl, and chill for at least 4 hours, tossing it once or twice.