Heat the oven to 350 degrees. In a large saucepan, combine the honey, barley malt syrup and fruit juice concetrate. Heat over medium heat until you can stir the mixture easily, but before it starts to boil, about 5 minutes.
Place the oats in a large mixing bowl. Add the honey mixture and stir rapidly and thoroughly to coat the oats. Spread them in a thin, even layer on a large nonstick baking sheet (you may need two). Place it in the oven and bake until the granola is crisp, no more than 15 minutes. Watch carefully, or the granola may burn.
Remove the baking sheet to a cooling rack. Let the granola cool thorougly on the baking sheet. Place the granola in a large bowl, break up any large chunks, stir in the raisins and transfer to a tightly covered container.