The refreshing vinaigrette balances the rice salad's sweetness.
Combine first 5 ingredients in a large bowl, and stir well with a whisk. Add rice and next 4 ingredients (rice through carrot); stir well.
Combine lemon juice and next 6 ingredients (lemon juice through 1 garlic clove) in a large bowl; stir well with a whisk. Add spinach; toss gently. Serve rice mixture over spinach mixture.