Peel and dice the mango. Add to a blender with the avocado, water, soy sauce, lime juice, garlic, chili powder, mint leaves, ginger, and salt. Blend on high-speed for 20-30 seconds, or until smooth.
Taste and adjust the seasonings to your liking, adding more chili and/or ginger for spiciness, salt/soy sauce for saltiness, and water if you want a thinner consistency.
Transfer to a large bowl or saucepan and refrigerate for at least 1 hour. Serve fresh as an appetizer in shot glasses, or small bowls. Top with mint leaves and a pinch of chili powder.
Gazpacho will keep for up to 3 days in the refrigerator.