At least the transition should be fairly smooth.
Times, Sunday Times
They are also generally easier to clean than the wheel underneath, being fairly smooth and less prone to accumulating dirt.
Times, Sunday Times
Let them cool and then place in a food processor and blend till you have a fairly smooth pulp.
ST
Mash everything up until fairly smooth, season to taste with a good amount of salt and pepper and squeeze in the lime (or lemon) juice.
The Sun
Then add the raw onion, throw the whole lot in a blender and whizz until fairly smooth.
Times, Sunday Times