Given the background description of some cooking related query, summarize the question into a title

How do you prepare fresh fennel for cooking? My isntructions just say to "roughly chop", but don't say what parts of the plant to use.
How do you prepare fresh fennel for cooking?

Currently there is a question about magnetic stripes vs wood blocks, but I was wondering what the general concensus is regarding knife sheaths (like this one) They seem great if you only have a couple knives -- they don't require counter space and aren't at risk of causing accidental harm by falling off a wall. What are the pros and cons of using these instead?
Storing knives in knife sheaths

I am doing chapatis with quinoa flour. How can I remove or hide the bitterness of the quinoa?There are several constraints for the solution: no egg, wheat, soy, dairy, corn, rice, meat.

How to remove quinoa bitterness (with many restrictions) doing chapatis