- STEP 1
Heat the oil in a pan on a low heat, then add the onions. Continue to cook on a low heat for 5 minutes or so, until the onions are starting to soften. Add the vinegar and sugar and cook (still on a low heat) for another 5-10 minutes, stirring occasionally.
- STEP 2
Meanwhile, toast your bread in a toaster or under the grill, then drizzle with olive oil.
- STEP 3
When the onions are done, spread evenly on the toast then crumble the cheese over each slice and serve with side salad.