Prepare macaroni according to package directions. Drain macaroni well, and rinse with cold water until pasta has cooled.

Meanwhile, in a large bowl, combine mayonnaise with chicken stock.

Whisk together well and season with a bit of salt and pepper.

Add in drain pasta along with green pepper, radishes and onions. Stir until well combined.

Cover with plastic wrap and refrigerate for at least 3 hours.