DSL Embedded :: Reducing packages installed

I spent yesterday evening installing DSL and was REALLY impressed.
I feel really bad about asking, but how to I remove packages from an installation image?

I need to have a small installation without unnecessary packages. (I have a homebuilt aircraft and have designed sensors to measure air pressure / speed, engine temps, rpm, GYRO etc. for logging the data together with a GPS feed ... btw a microcontroller with 8K ROM is a really challenging foorprint    Each one of the sensors implements a USB Com port, so interface to a 'proper' computer is easy).

I want to create a data logging application on a compact device ... and also display the output in a graphical manner, emulating traditional analogue controls ... an Open Source EFIS.

I'm doing the development in Java to make it portable.

DSL - Wonderful ... LiveCD, Frugal etc. all work well.
Java Runtime - Installed OK (eventually).

However, what I really need is a minimal machine ... OS, JRE and application.  I do not need some of the applications and servers that come with DSL and, for reliability and performance, wish to control what gets installed.

I have searched these fora and have learned a lot of valuable information about adding packages to an image; but can find nothing on how to create a new ISO image with applications removed.

Many Thanks in advance.
Steve