Place the flour in a large bowl and create a well in the center. Crumble the yeast into the well and add the sugar. Pour in the lukewarm water and let it stand for 5-10 minutes, until the yeast activates.
Once the yeast has proofed, add the olive oil, salt, and pesto sauce. Mix everything together, then knead the dough until it is smooth and elastic.
Form the dough into a ball, place it back in 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 (approximately 1 inch). Place it in a baking sheet greased with olive oil.
Arrange the chopped sun-dried tomatoes on top of the dough and sprinkle with Parmesan cheese. Let it rest for another 15 minutes.
Bake in a preheated oven at 430°F (220°C) 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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