looking for a substitute
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Merrill is a co-founder of Food52.
What's the recipe you need it for? You could use lemon zest to get a similar citrusy perfume, but it won't be exactly the same. I've also heard that a combination of mint leaves, fresh ginger and lime juice is also a good substitute.
toful broc/carrots curry type dish with coconut milk.
Sam is a trusted home cook.
Depending on where you live, your supermarket might have Lemongrass paste in the produce section.
It's pricy but keeps well. My Publix, Target and wal-mart has it. I find it easier to incorporate in some dishes like rice and has a great taste. Gourmet Garden is the brand name, it's in chilled section in produce near the jarred dressings. http://www.gourmetgarden.com/us/sitemaps
On the sitemap there's a store locator, I hope this help.