Sounds disgusting but that's fine as it is for Ruby. I read an article recently, from a vet that feeds their dogs on a raw diet. He suggested that if you want to slightly cut down on the amount of meat, increase vegetables (therefore reducing calories) and add oats, then porridge is the way to go.
He recommends just cooking the oats first so yesterday morning, I gave it a whirl. Into a microwaveable bowl went 80g of oats and double the weight of cold water. It was cooked for 3 minutes.
Whilst that was doing, I chavelled up in my food processor, 6 medium carrots, 6 outer green leaves of a savoy cabbage, and a 1" slice of swede. This was added to the porridge and left to soak.
Once ready, I used my 2" ice cream scoop to dollop amounts into silicon cake pans and froze them:
I am also increasing her wet green tripe to one packet every other day. She adores this and it is the most beneficial but lower calorie food she can have. Watch this space!