Besides roasted chicken, what can leftover piri piri sauce be used for?

A little back story here; piri piri dates back to the days when the Portuguese had colonies in West Africa---sometimes it's known as pili pili. Myself, I think that in addition to chicken it goes well the Brasilian/Portugese hybrid stew, feijoada. Great as well with porco a Alentejana---sizzling hot pork and clams. Do you like goat? It's great with that too.

With eggs - fried, poached or scrambled - on some kind of toasted bread, or flat bread.

I like it as a sandwich spread. Especially for a roast chicken sandwich but also delicious paired with avocado, melted cheese and arugula.

Prego rolls! You can google a recipe. A Portuguese Mozambican sandwich

Besides the above answers, you could throw it in tomato sauce and toss pasta in it. Or use the same sauce and make pizza/flatbread (with complimentary toppings, or not, and just use the sauce for a spicy kick).

I hear it's good with grilled shrimp or you can bake the shrimp in the piri piri.

When I make bread I slather the top with piri piri before I bake it. Delish!