I'm trying to make a firmer ganache for truffles, but can't get the ratios of hazelnut paste, milk chocolate and cream right. I have Wybauw's and Notter's books, but they don't mention any ratios when it comes to nut pastes. If I reduce the amount of cream to make it firmer, the ganache separates and when I emulsify it well - it's too soft for hand rolling. I don't want to use liqueur, just pure hazelnut paste 1:1 to milk chocolate, but cream is the problem. Can somebody advise me, please?