Place the flour in a large bowl and make a well in the center. Crumble the yeast into the well and add the sugar. Pour in the lukewarm water and let it sit for 5-10 minutes, until the yeast activates and becomes frothy.
Once the yeast is frothy, add the olive oil and salt. Mix well, then knead the dough until it is smooth and elastic.
Shape 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 1 inch (2-3 cm). Place it in a baking sheet greased with olive oil.
Peel the red onions and slice them into thin rings. In a skillet, lightly sauté them in olive oil for 5-7 minutes, until they begin to soften and become translucent.
Pour the balsamic vinegar over the red onions and let it simmer for another 2 minutes. The vinegar will caramelize slightly, enhancing the onion's flavor.
Evenly distribute the sautéed red onions and balsamic vinegar over the dough. Gently press them into the dough so they adhere.
Bake in a preheated oven at 430°F (220°C) for 20-25 minutes, until the focaccia is golden brown and crispy.
After baking, let it cool for 10 minutes, then slice and serve.
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