First, chop the bacon into 1 cm lardons then set to one side. If any pieces of bacon are stuck together, make sure to separate them with your hands, otherwise they won't crisp up properly!
Peel the onions & garlic. Finely dice the onions and grate the garlic. Set both to one side, keeping them separate.
Next, place a large saucepan over a medium heat, add in the tbsp of vegetable oil then leave to heat up for a minute. Once the oil's hot, add in the bacon then cook, stirring frequently until crisp & golden. This will take around 5 minutes.
Once the bacon is cooked, use a slotted spoon to transfer it to a plate (or bowl) lined with kitchen paper. Make sure to leave the fat in the pan, we'll be using it to cook the onions in!You'll need around 1 tbsp of fat, so add in more vegetable oil if needed. Next, turn the heat down to medium-low then add in the diced onion & a pinch of sea salt. Cook, stirring regularly until the onions are soft & translucent and are just starting to caramelise. This will take 10-15 minutes.
Once the onions are cooked, add in the garlic, rosemary & paprika then cook for another minute, stirring frequently.
Add the bacon back into the pan, stirring it through the onions then add in the balsamic & white wine vinegar. Use a wooden spoon/spatula to scrape the caramelised bits off the bottom of the pan, to deglaze.
Next, add the brown sugar, maple syrup, espresso & Worcestershire sauce into the pan then turn the heat back up to medium. Bring the jam up to a gentle simmer then cook, stirring occasionally until the liquid has reduced into a thick syrup. This will take around 10 minutes.Brew your coffee whilst the onions are cooking. Also, don't let the liquid reduce completely! Once the jam is cooked, take the pan off the heat then season to taste with sea salt & freshly cracked black pepper.
To finish, transfer the bacon jam to a blender (or food processor) then give it a quick blitz to break the bacon down slightly & give the jam a more spreadable consistency. You can blend the jam as smooth as you like. I like to keep it fairly chunky. Transfer the bacon jam to a container, let it cool then chill in the fridge until needed. Or serve it straight away!