My Roommate Put the Wrong Thing in My Brand-New Slow Cooker—Minutes Later, the Ceramic Insert Was Destroyed

My Roommate Put the Wrong Thing in My Brand-New Slow Cooker—Minutes Later, the Ceramic Insert Was Destroyed

I had owned my first slow cooker for exactly one week.

I was ridiculously excited about it. I had already imagined coming home to pot roast, soups, chili, shredded chicken, and all those comforting meals people swear are easier when you can throw everything into one pot and walk away.

Then my roommate decided to use it.

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When I walked into the kitchen and saw the damage, I genuinely didn’t know what I was looking at.

The ceramic insert was blackened, cracked, and badly damaged. A huge section appeared to have broken away, leaving the slow cooker looking as though something had burned straight through it.

My first question was obvious:

What on earth did she put in there?

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But the more important question is one every new slow-cooker owner should know the answer to:

What should never go into a slow cooker—and what can actually destroy the crock?

A Slow Cooker Isn’t Just a Regular Pot

A typical slow cooker consists of an electrical heating base surrounding a removable stoneware or ceramic insert.

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That insert is designed for gradual, relatively even heating.

It’s excellent for foods containing plenty of moisture: stews, soups, braised meats, beans, sauces, casseroles, and similar dishes.

What it isn’t designed for is every random heating job someone might normally do with a saucepan, frying pan, oven, or microwave.

One of the biggest enemies of ceramic cookware is thermal shock.

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That happens when ceramic experiences a sudden, extreme temperature change. The material expands or contracts unevenly, creating stress that can cause cracking or even catastrophic breakage.

For example, putting a very cold insert directly into intense heat—or pouring very cold liquid into extremely hot stoneware—can be risky. Exact restrictions vary by manufacturer, so the manual for your particular appliance matters.