Combine first 5 ingredients in a small saucepan. Bring to a boil, and cook for 1 minute, stirring constantly. Spoon mixture into a bowl; cover and chill.
Melt butter in a large nonstick skillet over medium-high heat. Add almonds, sunflower kernels, and noodles; cook 3 minutes or until lightly toasted, tossing occasionally. Spoon mixture into a large bowl; cover and chill. Add vinegar mixture to noodle mixture; let stand 15 minutes. Add cabbage, carrot, and onions, tossing to coat.