Caldo Verde (Portuguese Potato and Kale Soup With Sausage)

Linguica or other garlicky pork sausage, cooked

Chives, fresh

bunch Curly or lacinato kale

medium cloves Garlic

Russet potato, peeled, quartered, and cut into 1/4-inch slices (about 1/2 pound; 225g), large

Yellow onion or large leek, finely diced (about 8 ounces; 225g), medium

Yukon gold potatoes, peeled, quartered, and cut into 1/4-inch slices (about 1/2 pound; 225g), medium

Chicken stock, homemade or store-bought low-sodium

Kosher salt and freshly ground black pepper

Olive oil, extra-virgin

Butter, unsalted