There are lots of cheap imitations out there

follow these simple guidelines:

Diameter: 27cm

just don't expect to pack in a whole lettuce worth

which prevent extra thin or soft slices from sticking to the blade

Deluxe Simmer Ring Picnicware There are lots of cheapPrevent liquids from boiling over with this stove top ring. When placing the stove top ring under the pan, the ring diffuses the heat evenly to allow simmering and is ideal for use when making sauces, custards or when heating milk. The ring also protects your saucepans from scorching, burning, cracking and over heating. Ideal for use on gas and electric hobs and ranges. Diameter: 18cm Handwash only 12 month guarantee