The saucier can hold... maybe about a cup of jus? There's only one and it's placed in the center of the table, passed around to guests after they've been served the meat and sides. Salad is never served along with hot items, it is sometimes served before, more often served after, usually by itself. There is, however, one exception, and it is with "Sauteed fried potatoes". I'm not sure how else to call them, it's when you cut potatoes in a large dice (3/4 to 1 inch cube), put some oil and a LOT of duck fat in a pan, heat super hot, and fry the potatoes in it. They end up almost like cubed french fries kindof. Then salad is served in the same plate along with the potatoes. And in that case you're right I wouldn't want jus anywhere near my salad, but I don't think we've ever served meat with jus along with fried potatoes and salad.
Thanks for the description of the mustard sauce. I often do something like that but with white wine instead of chicken stock because I never have enough chicken stock in hand. I'll have to try with chicken stock though, I'm sure the consistency is much better.
Just the other night my wife came home with pork chops and fennel bulbs. Usually I would sautee thinly sliced fennel with a bit of lemon and parmesan cheese, but this time I wanted something different, so I got inspired by that pork butt/onion/lemon recipe you linked to. First I rendered some of the fat from the chops, then I quartered the fennel bulbs and colored them in the fat, added some lemon juice and a small amount of honey, carmelized the fennel some more, covered the pan and placed it in the oven until the fennel was very tender. It was beautiful, nicely golden brown and very tender, I thought it was very good, although next time I'll try with even less honey (maybe just a teaspoon for the 3 bulbs) and a bit more lemon.