My first thought was to use a colander over a pan but then I realised I don't have a colander. For my straining needs I use the inside of this pasta pan (on left).
I thought about using that. But the sieve part of the pan sits too low in the pot part to allow enough room for water.
I thought about suspending the sieve part higher with a wooden spoon, but this seems like an accident waiting to happen.
It dawned on me at the time of writing that I have other pans one of which happens to be a good size, so I'll post that as one answer, but I'd be interested in other solutions, especially if no other pans happened to be a good size.