I just loved this milkshake. I have never seen this any juice shop or restaurant. Bangalore is full of Guava selling vendors (especially when you are stuck in traffic). But a warning. Please don't eat it with the chilli powder and salt applied by the vendors as it is unhealthy.
Sugar according to taste
Milk- 1 cup
1. Mix the guava pieces (peeled), sugar and milk in a blender.
2. Strain it to remove the seeds (I skipped the step as I enjoy eating them).
3. You can add vanilla ice-cream with the blended milkshake and serve for better taste.