Roast leg of cervena venison, sweet potatoes, and cranberry hollandaise sauce - Cervena

Ingredients

• 600 g leg of Cervena venison
• 3 tbsp vegetable oil
• 1 tsp herb salt
• 650 g sweet potatoes
• 1 Orange
• 4 eggs
• 150 g unsalted butter
• 100 ml red wine
• 100 ml cranberry juice
• 1 tsp tarragon vinegar
• 50 g dried cranberries
• pinch of salt
• pinch of black pepper
• pinch of freshly ground nutmeg
• 1 tbsp brown sugar