In a large bowl, combine water, yeast and honey and let stand for 5 minutes. Stir in 1 cup of flour and 1/4 cup of oil; let stand for 5 minutes. Stir in remaining flower and salt and knead until smooth. Transfer dough to oiled bowl, cover with plastic and let stand for 1 hour.
In a medium skillet, heat 1 TBS olive oil. Add thinly sliced onion, cover and cook over low-moderate heat, stirring occasionally for 10 minutes. Add sugar, cover and cook, stirring occasionally until golden brown (10-20 additional minutes). Set onions aside.
Preheat oven to 450°. Oil a 9 x 13 inch rimmed baking sheet or baking pan. Transfer the dough to the pan and press down to fit. Dimple the dough all over with finger tips and drizzle with 2 TBS of olive oil. Let dough rise until puffed, about 20-30 minutes.
Scatter onions over dough. Arrange pear slices over onions and top with crumbled blue cheese. If desired, drizzle with additional 1-2 TBS olive oil. Bake for 20 minutes, or until golden. Transfer to a rack to cool and remove from pan after 15 minutes.