Combine vegetable broth and shrimp in a pot over medium-high heat. Bring to a low boil for 10 minutes, then lower heat and simmer for 10 minutes. Remove shrimp from the broth and remove and discard shells; set shrimp aside.
Add lime juice, lime pulp, chile peppers, lemon grass, tom yum paste, fish sauce, sugar, chile sauce, and ginger slices to the broth; cook for 10 minutes. Remove chile peppers, lemongrass, and ginger slices with a slotted spoon and discard. Add cooked shrimp and remove from the heat.
Ladle soup into bowls and top with mushroom slices and green onions.
Regular white mushrooms can be used in place of baby bellas.
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