Preheat oven to 375 degrees F. In a medium saute pan over medium heat add the oil and saute onions and raisins until both are tender, about 10 minutes. Set aside to cool.
Roll out 6 of the crescent pastry rolls and slice in half forming 2 triangles and 12 pieces total. To assemble, place a piece of salami and cheese on 1 triangle. Add a dollop of the onion mixture in the center. Starting at the wider edge, roll the crescent triangle to form a small croissant. Place seam side down on a baking sheet. Repeat with remaining ingredients. Sprinkle poppy seeds over each roll and bake for 13 to 15 minutes or until golden brown.