Cook, stirring frequently and seasoning with salt to taste as you go, until the onions are soft and a lovely burnished brown (about 45-55 minutes)
Add freshly cracked pepper over everything.
f you are not using thick Greek yogurt, line a colander with cheesecloth and set it over a bowl. Add the yogurt and let it drain for at least 2 hours before proceeding with the recipe.
Feel free to add chopped spinach or chard to the pasta just before it is finished cooking, and then drain all at the same time. Or blend the sauce with peas and freshly chopped mint.
Despite the simple ingredients, it is a rather rich dish, and this is why I state that it feeds 6. But it may only feed 4 very hungry people!!
Adapted from Genius Recipes