Just my opinion, but here goes: I don't think you need to supplement with calcium if you are using a balanced kibble and you are only 'topping it' (less than, say 40%). I've read that most kibble companies put alot of calcium in there b/c of the phlates in the carbs and that topping with meat won't offset the balance. Of course, you could always ask the company. This could be mis-information on the web.
Continuing on with my opinion: If you are using a kibble with grains, then I don't think you need to add any more in. If I were feeding a normal kibble (not one of the low carb, high protein ones), then I think I would just top with plain meat. I could do this to an extent with my guys, but if I were to add too, too much meat, then I suspect I would need to add in veggies simply b/c my two only have firm poops within a certain range of meat: veggie/carb ratio. But generally speaking, with a normal kibble, I think you will see the best results with just adding real meat. You could top with cooked or raw meat - just don't add bones -- just plain meat. This could include eggs and cottage cheese - just make sure and get low sodium. I liked using ricotta cheese, but it is more expensive, but it is also better balanced. You could also top with plain yogurt.
Having said all that, if you really feel that you want a receipe, I can tell you the basics of what I do. But, I would find out about the calcium in the kibble, simply b/c I think dogs may be like people, in that they can only absorb so much calcium per meal - and the excess ends up somewhere that you might not want it to be.
When I homecook, I do this: (I have big dogs, so takes lots of food).
10 lbs ground meat, 5 lbs veggies/carbs. The veggies and carbs must be cooked very well b/c the dogs can't break them down very well. Fresh veggies take longer to cook than frozen ones. I also make sure the veggies are not in big chunks. I use only a limited amount of the crucifer veggies b/c of some reason I can't recall at the moment - stayiing less than 10%. I do not use grains, as my guys have grain allergies. Grains are high in phylates that block the calcium uptake, so since I am not using grains, I then don't have to go overboard on the calcium. I will use veggies, potatoes, etc.
I add in 3% of beef liver or 4% of chicken liver - I limit it b/c of the high amount of Vit A.
Since I don't feed kibble, I do add in calcium carbonate. I buy the NOW brand from iherb as it's cheap and the carbonate form does not bother my girls very sensitive stomach (the citrate does). To get the amount, I plug in the figures at nutritiondata - dot- com. If I am in a hurry, I just plug in the meat amount, adjust to one ounce. I will multiply the amount needed by the amount of meat. 16 ounces in a lb x 10 lbs of meat = 160. So, whatever figure I get, I multiply by 160. I go by the RAW figures as it is the RAW amount I start with and the final cooked amount will vary. I scroll down and there is the phosphorus and calcium. You are adding calcium to offset the amount of phosphours. I subtract the calcium from the phosphorus and then use that figure to multiply by 160 -- if using my amounts listed above (or whatever is needed for the amount of meat). I then multiply this by 1.15 and then that figure is the amount of calcium I need to add. Then I figure out how many teaspoons I might need for the whole batch. (teaspoons - not tablespoons). You could also just go by the phospourus amount and just match it and not multiply by 1.15 and you would be close. The 1.15 is what I personally worked out for my guys based on their needs. You could use anwhere from 1:1 calcium : phosphorus ratio to a 1.2:1 ratio (this is not 12 to one, but 1.2 to one )
to stay in a generally safe range. The amount of calcium needed to offset the liver is also calculated, but it generally means I just add in a pinch more.
Was that confusing or what? And it wasn't a 'receipe' like you asked, so I'll be reading what others have to post for actual 'receipes" where it's all figured out.
If I were just topping the balanced kibble, then I would make it easy on myself and just add cooked ground meat that I have pureed in a blender and frozen in small batches. That's easy and tasty for the dogs. Or top with yougurt, eggs, cheese, canned jack mackeral or salmon, etc. Super easy this way.
But, again, I am sure others will come along with easy receipes, and I know I didn't really answer your question. Once again, I was in a talkative mood -- hope you didn't mind too much.
Now, off to feed my guys................