how do you build a grease trap in a grey water line?

Recently, we changed some of our household drainage lines, diverting the kitchen sink line from the septic tank and out the other way, all through PVC pipe and eventually underground. My husband said he needs to build in a grease trap before he covers the pipe so that he can clean out the grease that will inevitably collect and eventually clog the drain. He says these used to be used a lot in older homes. Does anyone know the best way to do this? Thanks!

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