Praliné paste is an ingredient very much used in French pastries. I found it difficult to get (a good) one in New York. I know it is always possible to order online, but it's a gold price!
I decided to make my own.
It's not difficult, and it's worth it in terms of taste and money!
PRALINÉ PASTE
The recipe:
Almonds (unsalted unroasted with skin)  |    2 1/4 cup   |    10.6oz  |    |
Hazelnuts (unsalted unroasted with skin)  |    2 1/4 cup  |    10.6oz  |    |
White Sugar   |    2 cups  |    14.1oz  |    Syrup boiled to 239°F and poured on dry fruit  |   
Water   |    ½ cup  |    3.5oz  |   
Step by step:
Weigh almonds and hazelnuts and put into a sauce pan with a thick bottom. A copper saucepan would be the best, but don't worry. I did without it and it worked!
Feel free, like me, to add some vanilla beans.
Make a syrup with the sugar and water, bring to 239°F/115°C.
Pour onto the dry fruit off of the stove.
Rapidly mix with a wooden spoon or a spatula until crystallization of the sugar.
It becomes very "sandy" and white.
Put back onto the stove (medium/high) and stir until the mixture caramelizes again. It takes about 20 minutes. Don't stop turning, to prevent almonds and hazelnuts from burning.
Pour onto a silpat and let it cool completely.
Break into small pieces before putting into your food processor. 
Mix little by little until it becomes a powder.
The praliné will express the best of its flavor after a week, the time given to allow the oil to capture all the aroma.
You can keep a little bit of powder, called "pralin," and use it in desert...on top of ice cream, for example, to flavor some cakes, etc.
Praliné paste can be kept refrigerated for a few months. 
Enjoy!






