Season turkey schnitzel on both sides with salt and pepper.
Trim and cut spring onions on the bias into slices.
Heat oil in a large skillet over medium-high heat. Fry schnitzel 4-5 minutes per side until golden and cooked through (internal temperature 74°C / 165°F). Remove to a plate.
In the same skillet over medium heat, fry the spring onions for 2 minutes, stirring occasionally.
Pour in chicken broth, balsamic vinegar, and honey. Bring to a boil, then reduce heat to low and simmer for 5 minutes until slightly reduced.
Add 125 ml sherry, marsala, or brandy. Season with salt and pepper.
Return schnitzel to skillet and simmer for 2-3 minutes until heated through.