Focaccia with Onions

Dough

• 1 oz olive oil, plus extra to grease
• 22 oz bread flour
• 1 oz fresh yeast, crumbled
  ou 3 tsp dried instant yeast
• 13 ½ oz water
• 1 pinch sugar
• 1 tsp salt

Topping

• 3 tbsp extra virgin olive oil
• 3 tbsp water
• 1 ½ tsp salt
• 10 ½ - 12 ½ oz yellow onions, halved