OK, I have a very annoying problem with my Ragu. In lots of Ragu recipes, there's a step where you add milk to your sauce and let it simmer for 4-6 hours into a stew. Now the problem is that when I add milk to the sauce and let it simmer, lots of scum rises to the top. And it's too much for me to skim it all off. By the end of the whole process, my ragu is covered with little white specs of scum. It still tastes delicious, but these white spots on my ragu just drives me crazy! I thought it was because my milk was curdling, so I used half and half and still got the same result. I'm assuming the scum is from the meat now, not the milk.
I would prefer to just forgo the milk all together and just add water or stock if I can't get rid of this problem. I stew/braise stuff all the time and I rarely have to skim off scum. Where does this scum come from? Is it the dairy? Does this happen to you or should I just roll up my sleeves and skim as hard as I can?