Wash and drain the grapes and set aside.
Crumble the yeast cube.
Stirring with a metal teaspoon, dissolve yeast and honey into 100 ml warm water.
In the mixer's bowl, mix the dry ingredients except the salt.
Add the yeast dissolved in water and olive oil to the flour.
Start kneading with the dough hook and add 200 ml of warm water a little at a time.Kitchen Note: the dough should be soft and sticky; if you do not need it, do not use all the water. If, on the contrary, more is needed, add a tablespoon at a time. Also, add the salt and knead for about 10 minutes more.
Cover the bowl with plastic wrap and let it rest for an hour.
Divide the dough in half.
Lightly oil the baking sheet. Transfer half of the dough to the pan and gently press it out to fill it.
Drizzle 2 tablespoons of olive oil and 2 sugar over the dough and arrange the grapes across its surface. Gently press the grapes down into the dough.Sprinkle with grated lemon zest. Roll out the other piece of dough and cover the cake.
Seal the edges of the cake with your fingers and prick the surface with a toothpick.
Sprinkle the surface with sugar, olive oil, and, eventually, grated lemon zest or dried thyme.
Cover with a kitchen towel and let rest for another hour.
Bake in a preheated oven (190C degrees/374F) for 30-40 minutes or until golden brown.
Let cool out of the oven before serving.
Store any leftovers, well wrapped, at room temperature for a couple of days; freeze for longer storage.