Add in the vegetable stock, fish sauce, syrup and carrots. Stir and let simmer for 15 minutes or until carrots have softened.
Slowly add in the coconut milk, shrimp and mushrooms. Allow to simmer for an additional 5 minutes until shrimp is opaque and pink and the mushrooms start to soften. Season with salt and pepper.
Divide the soup among four soup bowls. Finish with a squeeze of lime juice and top green onions, cilantro, and jalapeno slices. Serve immediately.