Here are few addresses of  groceries where one can buy curries, masala, dal and other products from India.

• Amazing Oriental
  Korreweg 51
  9714 AB Groningen
  Tel: 050-577 6538
  Web:www.amazingoriental.com
  Chinese supermarket. Also sells vegetables, dried fish, duck etc. and also frozen products like dim-sums, fish products etc.
  
  
• Avondwinkel
  Attn: S.H. Saraff
  Poelestraat 47
  9711 PK Groningen
  Tel: 050 - 311 06 20
  
  
• Turkse Bakkerij
  Poelestraat 38
  9712 KB Groningen
  Tel: 050-3131190
  Note: They have also calling cards
  
  
• Toko Melatie
  Gedempte Zuiderdiep 126
  9411 HM Groningen
  Tel: 050-3129886
  Web:www.toko-melati.nl
  
  
• Toko Soeradj Center
  Surinami Indian shop
  Korreweg 26
  9715 AB Groningen
  Tel:050-571 1305