Mahnke Family Recipes- Kielbasa, Potato and Leek Gratin

Ingredients

• 4 T / 56 g Butter
• 1 1 ⁄ 2 c / 375 g Minced leeks, white and light green parts only
• 3 T / 15 g Flour
• 2 c / 454 g Milk, heated
• 1 ⁄ 4 c / 25 g Grated gruyere cheese
• 1 ⁄ 4 c / 25 g Grated Parmesan cheese
• 1 T Dijon mustard
• 1 t Salt, pepper and freshly-grated nutmeg
• 1 large Garlic clove, peeled
• 2 lbs / 900 g Idaho potatoes, peeled and sliced
• 1 1 ⁄ 2 lb / 681 g Smoked kielbasa, diced
• 1 ⁄ 3 c / 76 g Buttered bread crumb