Add the vegetable oil to a hot fry pan, then add the garlic and cook until fragrant.
Add the dried shrimp and stir fry for 3 minutes, or until crispy and golden brown. Remove from the pan and allow to cool.
Peel and segment the pomelo and break into bite-size pieces, and then place in a large mixing bowl. Add the dried shrimp, crab meat, mint, perilla leaves, Vietnamese mint leaves, Asian basil leaves, fried red shallots, fried garlic chips, and dipping fish sauce. Combine and mix well.
Transfer to a dish and garnish with peanuts and chile.
To make the dipping fish sauce: Combine the fish sauce, vinegar, sugar, and water in a saucepan and place on medium heat. Stir well and cook until just before boiling point is reached, then allow to cool. To serve, finely chop the garlic and chile and stir through with the lime juice.
NotesPomelo can be substituted with grapefruit. Mud crab can be substituted with blue swimmer or spanner crab.