Can I cook with it?
Yep, but there’s a couple things you need to know. First, avoid shock–this means changing temperatures drastically, and too quickly.
DO NOT use any Stoneware piece on the stovetop or any other direct heat source.
OVEN: Maximum oven-safe temperature is 500°F / 260°C. Use oven mitts for lifting at all times.
BROILER: When using under a broiler allow a gap of no less than 2 ½ inches between the rim of the dish and the heat source.
MICROWAVE: Handles may become hot during prolonged microwave use, especially if the handles are enclosed with plastic wrap. Cover just the open top of the dish, leaving the handles exposed.
FREEZER-TO-OVEN USE: Do not place a frozen dish of food in a preheated oven. Place the frozen dish in a cold oven and set the temperature, allowing the dish and oven to heat together. Before serving always check that the center of the food is completely and uniformly hot.