This is a simple technique I use for adding a juice or blood groove - whatever you want to call it - to a cutting board. It works regardless of the grain orientation of your board. You just need a router (I prefer a palm router for this), a round nose bit, and an edge guide for your router. This same task can be completed with a CNC or a router jig, but I find my way works well enough. Also, I don't own a CNC machine. :)

3/8" Diameter 1/4" Shank Round Nose Router Bit: https://amzn.to/32quD9z

Camera Gear (Amazon Affiliate Links):
Canon EOS 80D https://amzn.to/31xo81d
Rode VideoMicro https://amzn.to/2YIDUJK

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