Sausage, Zucchini & Potato Stoup

casings removed

small round, quartered

trimmed and sliced into thin wedges

large, peeled, halved lengthwise and sliced into thin wedges

sliced

firm, medium, halved lengthwise, then sliced 1/2 inch thick

or 12 to 16 cocktail tomatoes, a little bigger than cherry tomatoes

or chicken

or passata

chopped

or rolls, for serving