I love coming up with recipes that involve caramelized onions and since puff pastry makes a good combo with basically anything (doesn’t it? it does, right?), I was pretty sure these two would make a good match. The brown Creminis add a depth of flavor to the recipe and also add 72 mg of calcium, 100 mcg of folate, and 4.4 mg of zinc to the dish. Yes, yes, there is a lot of butter involved in this recipe, however, keep in mind this is an appetizer and it should serve 8-10 persons. The red onion offers the dish 55 mg of Vitamin C, 172,5 mg of Calcium, 142.5 mcg of folate. So overall, it’s a pretty nutritious appetizer, just stick to the serving size. Or don’t 🗽🎉.
You can make your own puff pastry from scratch using my puff pastry recipe or buy it frozen if you don’t have the time to prepare it at home. Works perfect both ways. You can try out this recipe with different types of mushrooms, such as Portobello, Shiitake, or Oyster mushrooms.
You can make one big puff as I did, or cut the puff pastry dough before adding cremini mixture in 8-10-12 cute individual ones. Totes up to you! 🎈
Full recipe & nutritional information below ⤵️ ✌️
- 5 medium-large red onions cut in circles horizontally
- 2 ½ tsp butter
- 2 tbsp balsamic vinegar or red/white wine
- 1 tbsp sugar
- 400 gr Cremini mushrooms or other, cut lengthwise
- 2 tsp fresh dill, frozen or dry work also
- 2 tsp dark soy sauce
- 400 grams puff pastry, chilled
- Cut the onions horizontally, in circles. The size of the circles should be roughly 0.5 cm/0.2 in.
- Melt 2 tbsp butter in skillet and add onions.
- Cook for 25-30 minutes on medium heat, checking and stirring every 3-4 minutes to avoid onions sticking to skillet.
- Add 2 tbsp vinegar and 1 tbsp sugar and cook for 5 more minutes.
- Season with salt to taste and set aside to cool.
- Cut the mushrooms vertically, 1 cm/0.4 in each slice.
- In another pan, melt ½ tbsp of butter and add mushrooms.
- Cook on medium heat for 3 minutes.
- Add soy sauce, cook for another 2 minutes.
- Season with salt, pepper and fresh dill.
- Spread puff pastry dough and roll it for a 30cm/12in length and 20cm/8in wide sheet.
- Spread caramelized onions from center of puff pastry dough to the edges.
- Remove excess liquid from cooking mushrooms and add them on top of onion.
- Brush puff pastry dough with 1 tsp of melted buttes.
- Bake at 190 degrees C/375 degrees F for 20-25 minutes or until puff pastry has risen and became golden.