Start by preparing the simple syrup: combine all the ingredients in a pot, bring to a boil, stir, and then turn off the heat and let cool to room temperature.
Gather all ingredients for building the baklava. Once you open the the package of filo pastry, immediately cover the sheets with a slightly damp (not wet) towel. This will prevent them from drying out. Trim the sheets according to your oven dish if needed.
Butter the bottom of your oven dish.
Take 2 sheets of filo dough and place a thin rolling pin at the base. Brush the top surface evenly with butter. Spread the chopped hazelnuts and 2 tbsp of hazelnut praline evenly on the surface of the dough. Then, using the rolling pin, gently roll the dough all the way to create a long roll and then carefully slide the rolling pin off. Avoid making it too tight which will make it harder to slide off the rolling pin.
Place your rolled baklava onto your oven dish, and repeat the previous step 5 more times, or however many it takes to fill up your dish.
Cut your rolls in whichever shape you would like. Then, generously brush the tops and sides of the rolls with melted butter.
Place into your oven, for around 45 minutes, or until it is nicely golden brown all around.
As soon as you take out your baklava from the oven, pour the simple syrup on top evenly. Let cool at least 3-4 hours before enjoying.
To serve, spoon some more Hazelnut-Berry Praline and sprinkle chopped nuts on top.
