Toss berries with sugar in a microwave safe bowl. Cook in the microwave for 40 seconds at full power until thawed.
Place chocolate chips and margarine in a microwave safe bowl. Cook in the microwave at 60% power for 45 seconds until melted. Use a fork to stir until smooth, then stir in soy milk until incorporated; set aside.
Spoon the soy yoghurt into a small bowl, then spoon fruit over the top. Pour on chocolate sauce and sprinkle with nuts.
Use frozen soy yoghurt from health food shops if you want to make this like an ice cream sundae.