Line an 8-inch square baking dish with foil, leaving a 2-inch overhang on two sides; lightly butter the foil. Combine the white chocolate chips, condensed milk, butter and salt in a large microwave-safe bowl. Microwave 1 minute, then stir well. Continue to microwave in 15-second intervals until the chips are fully melted, 15 to 30 more seconds.
Add the nuts, dried fruit and orange blossom water to the white chocolate and stir well. Pour the mixture into the prepared baking dish and spread evenly with a rubber spatula. Cover with plastic wrap and refrigerate until firm, at least 2 hours or overnight.
Lift the fudge out of the baking dish and peel off the foil. Cut into 1-inch squares with a sharp knife.