Heat an 8-quart saucepan over high heat. When very hot, add the oil, onions, and garlic, sauteing quickly for 1 minute. When the onions just start to turn golden, add the collard greens, raisins, and almonds. Season with salt and pepper, and add a little water if necessary, for a little steam. Saute for about 5 to 6 minutes more, and adjust seasoning, to taste.