Pre-heat the oven to 375F
Heat oil in a cast iron pan. Once hot, add fennel seeds and saute for a minute. Add onions and salt. Saute for a minute. Add ginger-garlic paste. Cook for 10 minutes.
Add carrots and beans and mix well. Pour water. Cook covered for 15-20 minutes.
Add garam masala and salt.
Mix well. Let it cool to room temperature
Cut the puff pastry into 3 x 1.5 inch rectangle each. Place the filling in the centre of each and cover with another one. Dip your index finger in water and seal the edges. Using a fork, create a pattern around the corner.
Bake at 375F for 30 minutes.