Sauce Hollandaise is one of the finest things you can make with butter. Butter is a solid animal fat, as is lard. This means you can exchange butter with lard for a meaty variant. And just in case someone is worried about the high satureted fat content of lard: lard has actually less of it than butter (~30% vs. ~50%).
Rillettes belong to the great classics of French charcuterie. Essentially it is just meat that has been simmered until it is falling apart. In principle rillettes can be made from all kinds of meat. But the traditional varieties are made from pork (Rillettes du Mans) and duck or goose. There is even fish rillettes, but this has nothing to do with the original concept anymore.