Place the flour in a large bowl and make a well in the center. Crumble in the yeast and add the sugar. Pour in the lukewarm water and let it stand for 5-10 minutes until the yeast activates.
Once the yeast is foamy, add the olive oil and salt. Mix well, then knead the dough until smooth and elastic.
Form the dough into a ball, return it to the bowl, cover, and let it rest in a warm place for about 1 hour, or until doubled in size.
When the dough has risen, roll it out to a thickness of about 2-3 cm. Place it in a baking sheet greased with olive oil.
Grate the Trappista cheese and cut the ham into thin strips.
Evenly distribute the grated Trappista cheese and ham over the dough. Gently press down on the dough so the ingredients are embedded.
Preheat the oven to 430°F (220°C) and bake for 20-25 minutes, or until the focaccia is golden brown and crispy.
After baking, let it cool for 10 minutes, then slice and serve.
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