Fennel Burger and Elderflower Onion Sandwich with Gruyère
If two passionate cooks are in a relationship you need a well thought-out kitchen plan. My boyfriend and I have a great passion for cooking, we love to experiment with recipes and ingredients but it just doesn't work at the same time. A cook is a leader and therefore needs total command in the kitchen to guarantee successful results. So many, many years ago we made a wise decision: depending on the recipe, one of us takes over control and has the last word when it comes to the important decisions, and the other one just assists. It works perfectly, no discussions and no arguments as long as we stick to the plan and don't get in each other's way.
Luckily, we love the same cuisine, Mediterranean and North European comfort dishes. The preparations are always quite relaxed and most of the time very satisfying at table. While chopping and cooking, there is often wine, cheese and olives involved to nibble and chill, I've mentioned it so often, it's definitely my favourite way to end a day. However, life would be boring, if two people had the same approach in the kitchen and we're definitely two absolutely different personalities. We find inspiration in different ingredients, flavours and combinations. My man likes it a bit more crazy, wild and experimental when he takes over the kitchen. He often combines flavours which seem too far apart to my mind, but the results are delicious and that's what counts.
A few days ago he came up with the genius idea to deglaze onions with elderflower syrup, it was fantastic! And to make it even better, he placed them on top of juicy fennel burgers. So, you need to know, when he uses our fennel seeds from Malta, he measures them by the tablespoon and not the teaspoon, the aroma is strong and present in this recipe and pure bliss in combination with the elderflower onion's smoky sweetness. There was also a thin layer of melted Gruyère cheese in between and at that point I knew I would have to share this recipe with you! I loved it!
Fennel Burger and Elderflower Onion Sandwich with Gruyère
For 8 burgers (or 4 hungry people) you need
For the sandwiches
medium onions, cut in half and thinly sliced, 3-4
butter 1-2 tablespoons
elderflower syrup, about 6 teaspoons, to taste
salt and pepper
rustic white buns, cut in half, 8
crisp lettuce, 8-16 small leaves
Gruyère cheese, 8-16 slices
For the burgers
minced beef 1 kg / 2 1/4 pounds
dry breadcrumbs 80g / 1/2 cup / 3oz
organic eggs 2
garlic, crushed, 2 cloves
fennel seeds, crushed in a mortar, 2 tablespoons
salt 3 teaspoons
pepper
butter 1-2 tablespoons
olive oil
Start with the onions and fry the burgers at the end, you want them to be hot enough to melt the cheese.
In a heavy pan, heat 1 tablespoon of butter and fry the onions for about 10-15 minutes until golden brown and soft. Add more butter if they dry out. When they are done, turn up the heat and deglaze with a splash of elderflower syrup. Season with salt and pepper to taste, take off the heat and set the pan aside.
Mix the ingredients for the burgers in a large bowl (with your hands or the hooks of an electric mixer) and form 8 thick burgers with wet hands. Heat a generous splash of olive oil and a tablespoon of butter in a heavy pan and fry the burgers on medium-high heat for 1 minute on each side, turn down the heat to medium-low and continue frying until they are golden brown, add more butter if necessary. The cooking time depends on how well done you like them, cut a burger in half to check the inside. Once they are done, lay 1-2 slices of cheese on top of each warm burger immediately.
Arrange 1-2 slices of lettuce on the bottom half of each bun, lay the burgers with the cheese on top and finish with the onions. Close the buns and enjoy!
