Crispy and addictively delicious on their own (like potato chips), fried onions provide the perfect savoury flavour and crisp to round out this (and probably any other) smørrebrød. To make them, take half a large white onion and slice it thinly. Dredge the onion slices in a few tablespoons of flour (I like to use rye). Meanwhile, heat about a cup and a half of canola oil in a heavy-bottomed pot over medium-high heat. Once the oil is hot, add the floured onions in 2 batches. Stir occassionally with a slotted spoon (not plastic!) The onions are done when they are golden brown. Remove from oil and place them on paper towel to soak excess oil. Continue until all onions are fried.