Spinach, tomato, grape and beetroot smoothie

It's taken me a while to pluck up the courage to put spinach into smoothie machine, but I was pleasantly surprised by the results. Here's the ingredients I used:

Small handful of baby spinach leaves
5 cherry tomatoes
10 grapes
1 medium beetroot, precooked
enough orange juice to make it nice

I quite like it but my son seemed a bit more circumspect. Anyway, there's something special about eating spinach - seems to be quite energizing for me.