This is a "white" (no tomato) pasta bolognese, but you could add some tomato paste as desired (in Bologna, the amount of tomato in ragu bolognese is a hotly debated topic!). Adapted from a New York Times recipe
Extra virgin olive oil (as needed)
Salt, pepper
1 yellow onion, peeled/finely chopped
2 carrots, peeled/finely chopped
1 stalk celery, finely chopped
1 pound ground pork (original recipe called for mild italian pork sausage meat removed from casings, so feel free to use that, but we find it easier to just use ground pork)
1 pound ground beef
A small handful of diced/roughly chopped pancetta or bacon
~1.5 oz dried porcini mushrooms, soaked in water to rehydrate
1.5 cups dry white wine
2 cups beef stock
1.5 oz porcini in 3 cups lukewarm water *or* pancetta/bacon
1/3 cup goat kefir (or yogurt; original recipe called for cream, but the kefir adds a nice tang)
1 container pasta (we often use penne, but whatever shape you like...traditionally ragu bolognese is eaten with thin, handmade tagliatelle noodles)
3/4 cup parmigiano reggiano cheese
You can use the pancetta/bacon and/or porcini to add umami flavor; we recommend using at least 1 of them
Boil water for pasta
If using pancetta/bacon, crisp/render in pan to start
Saute onion/carrot/celery ~5 min, season with salt & pepper ~medium heat
Add meat, turn up to medium/high, brown well
Pour in wine, rapid simmer until pan is almost dry
Pour 1.5 cups broth & lower to medium, simmer gently/uncovered, stirring occasionally
If using porcini, chop them up & add with ~1 cup of the porcini water
Start pasta cooking
Add remaining broth/salt/pepper to sauce to adjust taste/consistency
Add kefir before removing from heat
Toss with pasta, reserving pasta water to add if necessary
Grate cheese on top & serve