Peel and wash the sweet potatoes, then steam them for 45 min.
While the sweet potatoes are cooking, prepare the mascarpone cream. Separate the egg whites from the yolks and beat the egg whites. In a separate bowl, mix the egg yolks with mascarpone, a pinch of salt, and thyme. Gradually fold in the whipped egg whites.
Once the sweet potatoes are cooked, mash them with a fork to create a puree. Mix in the cumin, paprika, ½ tsp of salt and ½ pinch of chili flakes. Mix everything well.
To assemble the tiramisu: Start by lining the bottom of the glasses with a layer of mascarpone cream. Add a layer of mashed sweet potatoes on top, followed by another layer of mascarpone, breadsticks, and rocket. Continue with another layer of mascarpone and finish with a final layer of mashed sweet potatoes.
Refrigerate the glasses for 30 minutes before serving.