Using less-middleware to compile multiple source CSS files into one?

In my Node.js application, I am using less-middleware to compile the LESS files into CSS files. Works great with single files:

app.use(require('less-middleware')({ src: path.join(__dirname, '../', '/public/css') }));

However, I was wondering if it were possible to take two source .less files, and compile (and optinally minify) them into one single .css file.