Vegetable Sausage Foil Pack Dinner

large (2 small) sweet potatoes

asparagus, each stem broken into 3 pieces

sausage links, cut into 1-inch chunks

small red onion, cut into wedges

yellow or orange pepper, cut into 1-inch chunks

small zucchini, cut in 1-inch chunks

kosher salt, divided

pepper, divided

Olive oil

Tin foil