Watch the Adding the Flat 9 online guitar lesson by TrueFire from Play Rock Guitar 7: Style Diversity
Adding the Flat 9 - Playing Example is a video guitar lesson presented by Fareed Haque and is sourced from Jazz Rock Workshop.
One of the techniques I use a lot to create a Punjabi sound is to pre-bend notes (while muting the string to keep the pre-bend silent) and then picking and releasing the bend.
As Nigel Tufnel puts it, "there is a very fine line between Chuck Berry and Ravi Shankar." There is a science to bending the string so you'll need to practice to create just the sound you are looking for.