Prepare the dough for basic focaccia, setting it to rise as in Step 4, above.
2
While the dough is rising, heat the two tablespoons olive oil in a skillet. Add the onion and saute over medium heat until very lightly browned. Set aside.
3
Once the focaccia dough has risen and has been placed in the pan ready to bake, as in Step 6 above, spread it with the sauteed onions. Sprinkle with poppy seeds.
4
Preheat oven to 500 degrees.
5
Bake 20 to 25 minutes, until browned on the bottom and lightly browned on top.
6
Remove from the oven and cover with slices of smoked salmon. Stir the sour cream to thin it and using a spoon, drizzle it over the smoked salmon. Cut into squares and serve.