
Step 1 · Brown the Beef
Heat the oil in a large, deep pan over high heat. Add the beef and cook for 5 minutes, breaking it up, until browned.
Step 2 · Cook the Onion
Add the onion and cook for 3 minutes. Add the potatoes, stock or water, thyme and salt and bring to a boil.
Step 3 · Simmer the Potatoes
Cover and simmer over medium heat for 12 to 15 minutes, stirring once or twice, until the potatoes are tender.
Step 4 · Add Mustard and Peas
Stir in the mustard and peas and cook uncovered for 2 minutes.
Step 5 · Finish with Cream
Remove from the heat and stir in the crème fraîche or sour cream. Taste before adding more salt, scatter with parsley and serve.