1 large red onion in rings
25 gr butter
2 tbsp sugar
salt and pepper
2 tbsp balsamic vinegar 4 tbsp mayonnaise
1 tsp spicy pimenton (or hot paprika)
1 large tomato in slices
4 hamburgers at room temperature
8 slices of Old Amsterdam Gouda
8 thick slices of rustic, sturdy bread
4 slices of pancetta

Melt the butter and fry the onion rings with the sugar. Let the sugar caramelize, quench with balsamic vinegar and cook for 5 minutes. Season with salt and pepper. Bake the pancetta. Mix the mayonnaise with the pimentón.
Brush the burgers with olive oil, salt and pepper. Grill them on the BBQ in 3-4 minutes per side nice brown. Place the slices of Old Amsterdam on the burgers, cover with a lid and let the cheese melt in about 30 seconds.
Lubricate the 8 slices of bread with olive oil and grill them briefly on the BBQ. Pay attention! The roasting goes fairly quickly. On 4 of the slices of bread you then put a slice of Old Amsterdam. Cover again with a lid, so that the cheese melts nicely. You are now ready to build citizens!
First you take the bread with the melted Old Amsterdam, then you put the slices of tomato, then the burger and on top of a tuft of caramelized onion rings and the pancetta. Finally a nice spoon of spicy mayo. Finish the Old Burger with the second slice of bread.