Lobster Thermidor Recipe | Rustle Up

Ingredients

• 1 Lobster
• 1 Onion, chopped
• 500 ml Fish stock
• 125 g Butter
• 50 g Plain flour
• 500 ml Milk
• 150 ml Double cream
• 100 g Grated Gruyère cheese
• 1 tsp Dijon mustard
• 2 Egg yolks