Potato, Sausage & Leek Gratin

This gratin skips the cheese entirely and lets smoked sausage, leeks, and buttery breadcrumbs do the talking. Diced red potatoes get layered with chopped leeks, green onions, and sliced smoked sausage, dusted with flour between layers, then milk poured over just to cover. The flour thickens the milk as it bakes, creating a creamy sauce without needing any cream or cheese.

Covered baking for the first hour lets the potatoes cook through in the milk while the sausage releases its smoky fat into the liquid. Uncovering for the last 15 to 20 minutes crisps the buttered breadcrumb topping into a golden, crunchy crust that shatters when you dig in with a spoon.

A sprinkle of fresh chives right before serving adds a sharp, oniony brightness that lifts the whole dish.

Chef Tips

• Dice the potatoes evenly so they cook at the same rate. Big chunks will still be raw when the small ones are mushy
• Pour the milk just to cover, not more. Too much liquid means a soupy gratin instead of a creamy one
• The flour between the layers is what thickens the milk into sauce. Don’t skip it
• Dot the breadcrumbs with small pieces of butter so they brown evenly across the top

Variations

• Use kielbasa or andouille for a spicier, more pronounced sausage flavor
• Add a layer of grated Gruyère or sharp cheddar between the potato layers for a cheesier gratin
• Swap leeks for fennel bulb sliced thin for a slightly sweeter, anise-scented version