This classic dish reflects the nurturing side of Elizabeth, who often takes the lead in the Thursday Murder Club, providing both guidance and sustenance for the team's adventures.
Preheat oven to 400°F.
Cook beef and onion in a skillet until browned.
Add carrots, peas, and stock, simmering for 10 minutes.
Transfer to a baking dish, covering with mashed potatoes.
Bake for 25 minutes until top is golden brown.