At a glance
You're building a gourmet hot dog that starts the day before with marinating sausages. The real work happens on grilling day: caramelizing onions until they're golden brown takes patience, then you'll mix up a mustard mayo, grill everything, and assemble it all with fresh toppings.
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Marinate the sausages
The day before, marinate the sausages in a mixture of spices and oil.
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Caramelise the onions
Peel the onions and slice into rings or half-moons. Heat some lard in a pot and add the onions. Cook over medium heat until golden, then continue until light brown. Season with salt and pepper. Add a splash of water if needed.
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Mix the mustard mayo
The caramelised onions will keep in the fridge for several weeks, so feel free to make a batch ahead of time. Stir the mustard into the mayonnaise.
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