Having a tasty dip makes eating vegetables a more pleasurable experience.  It's often a chore attempting to find a dip that is preservative free, w/out sugar or artificial sweeteners or a ton of ingredients that you need a degree in chemistry to decipher.

Raw Zucchini Hummus (yields over 3 cups; you can easily cut this recipe in half)

2 zucchini, chopped
½ cup lemon juice
1 tsp salt
1 ½ tsp cumin
1 cup raw tahini (the Artisana brand is nice; substitute regular tahini if you need to)
4 tbsp olive oil
½ cup raw sesame seeds

Vitamix instructions:

Put all ingredients in your Vitamix and blend to a rich perfection!

Food processor instructions:

Same as above. You may have a hard time blending the sesame seeds, so I recommend soaking them for a few hours first, halving the recipe, and stopping frequently to scape the bowl. You can also omit the seeds entirely, but in that case I also recommend omitting the olive oil to keep a thick consistency.