If you are not a sea food lover try the same curry with chicken. Vegetarians could try with paneer and vegans could try with tofu. This is a fiery curry, so if you prefer a milder flavour, reduce the chilli powder to taste. Using hot water to grind the paste will aid the poppy seeds to grind easily. Cooking in pressure cooker saves time. You can also cook in a skillet over medium heat for 12 to 15 minutes and then simmer to low heat for 5 minutes. When the oil starts to separate, turn off the heat. Crab or any seafood for that matter does not absorb a lot of salt or spices unlike other meat, so add salt or spices with care. You can use ginger garlic paste in case you do not have fresh ginger and garlic and grind only the other ingredients for the paste, but definitely there is a difference in the taste.