1/4 cup soy sauce
1/4 cup finely chopped green onions
2 Tbsp water
2 Tbsp brown sugar
1 1/2 Tbsp sesame oil
1 tsp minced garlic
1 tsp minced fresh ginger
1/4 tsp pepper
Combine all ingredients in small bowl; stir until sugar is dissolved.
For fondue -- trim all fat from 1 lb of beef tenderloin for sirloin and cut into 1" cubes and place in shallow dish or sealable plastic bag. Pour marinade over beef; refrigerate 2 - 3 hours.
To serve, heat fondue oil or broth. Pat beef cubes with paper towels to remove excess marinade to help prevent splattering. Cook cubes to desired doneness and serve with dipping sauces.