Cut the yellow and red bell peppers in half lengthwise, then slice them diagonally into bite-sized triangular pieces.

Slice the sausages diagonally in half.

Heat olive oil in a frying pan over medium heat, then add the sausages, yellow bell pepper, and red bell pepper. Stir-fry briefly.

Add the seasonings (sake, salt and pepper, sugar, ketchup, Worcestershire sauce, and garlic) and stir-fry until well combined.