Put the diced onion in a frying pan with oil and the sugar. Add the garlic and thyme.

NextWhen the onion is translucent, add the meat and a little oil and let it brown.

When the onion is translucent, add the meat and a little oil and let it brown.

NextAdd the wine and let the alcohol evaporate.

Add the wine and let the alcohol evaporate.

NextAdd the crushed tomatoes, salt, cinnamon and bay leaf and let it cook well over a gentle heat for about 15 min.

Add the crushed tomatoes, salt, cinnamon and bay leaf and let it cook well over a gentle heat for about 15 min.

NextMelt the butter and add the flour so it toasts.

Melt the butter and add the flour so it toasts.

NextGradually add the milk, stirring constantly.

Gradually add the milk, stirring constantly.

NextAdd the yolk and the cheese.

Add the yolk and the cheese.

NextBoil the pasta for 1 min less than the packet says.

Boil the pasta for 1 min less than the packet says.

NextMix with the lightly beaten egg, the thyme, the feta and the oil.

Mix with the lightly beaten egg, the thyme, the feta and the oil.

NextPut the pasta in a dish, add a layer of meat and cover with béchamel. Sprinkle Emmental over the top.

Put the pasta in a dish, add a layer of meat and cover with béchamel. Sprinkle Emmental over the top.

NextBake for 30-35 min at 180° and grill for 5 min more.