Wood apple is known as bel in Bangla. It has a smooth woody shell with a green, gray or yellow peel. The fibrous yellow pulp is very fragrant. Bel is a good  source of vitamin A, B, C and dietary fibre.
Ingredients:                                   
2 cups bel pulp (without seeds and fibre)
3 cups yoghurt                                          
1 cup sugar                                           
2 tbsp grated mix nuts                            
5 glasses water                                            
Crushed or cubed ice                                                 

Method:
Blend the pulp, yoghurt, sugar and water in a food processor. Make a smooth and thick lassi. Now pour in the glasses and add ice to it. Garnish with the grated nuts and serve.