Mustard Glazed Brussels Sprouts with Hazelnuts

Toast hazelnuts in a single layer on a cookie sheet at 350 degrees until delicately brown, about 10 minutes. Clean the brussels sprouts by peeling off any brown leaves. Cut a small amount off the bottom and make a cross in it. This does not have to be deep, it just facilitates the cooking process. Steam the brussels sprouts until just crisp, about 8 to 10 minutes. In a heavy, large skillet, over medium heat, melt the butter. Remove from the heat and add the mustard and salt and pepper. Be careful, it may splatter! Return skillet to medium heat and add the brussels sprouts. Cook until heated through, stirring occasionally. Mix in the nuts. Serve immediately.