The secret to a pavlova filled with coulis is a nice layer of melted, cooled chocolate. I always use Valrhona as it is truly the best quality and the most delicious (not an ad). Here i used their strawberry (pink) chocolate.
For this specific pavlova, i made the meringue with some pumpkin spice and tonka beans powder. Recipe of meringues on my website. I added to the mascarpone whipped cream a couple of tablespoons of chestnut cream.