For Danish Hot Dogs, heat the sausages in hot water, slice the baguettes and toast on both sides. Cut the pickles into thin slices, peel and dice the onions. Spread tomato ketchup on the toasted baguette halves, then place the cooked sausages on top.Top with gherkins and onions, then add the mustard.
Finally, garnish the Danish hot dogs with the dried onions.