Combine the flax with 1/3 cup of water and set aside. Combine the oil, tahini, and sugar, and then add the flax mixture and stir well. In another bowl, combine the flour, baking powder, and salt, then add to the wet mixture. Finally, add soy milk and lemon juice, then fold in the nuts and raisins.
Pour the batter into an oiled pan, sprinkle with poppy seeds, and bake at 350 degrees for 1 hour.