Coat with the flour, working the flour all over the shallots.
Heat the oil in a small frying pan and line a plate with plenty of kitchen paper.
Once the oil starts to shimmer, drop in a piece of onion.
Drop in the shallots and fry for 1-2 minutes until lightly golden brown
Remove with a slotted spoon onto the paper-lined plate, Set aside.
To make the dressing
Put the fish sauce, rice vinegar and sugar in a small pan and heat gently to melt the sugar, giving it a stir now and then. It will smell very strong as it heats but it’s meant to!
Once the sugar has melted, take the pan off the heat and stir through the chilli, garlic, spring onion and the juice of 1 lime. Allow to cool
Using a sharp knife, slice the top and bottom off the Florida grapefruit. Peel by slicing off strips of skin, cutting vertically down the side. Remove as much pith as possible but leave all the flesh. Once you’ve got rid of the outer pith, slice into the segments and remove them whole, getting out as much flesh as you can.
Roughly chop into chunks. Discard the centre and any pith.
For the salad
Boil water and cook the glass noodles for 4 minutes. Rinse under cold water once cooked.
Stir the crabmeat, noodles, prawns and herbs through, using a large serving bowl.
Mix in the grapefruit chunks and coat everything in the dressing
Let everything soak together for a minute or so, then scatter the crispy shallots on top.
It may need an extra squeeze of lime juice, add it as you see fit then serve immediately whilst sitting in the sunshine!
Recipe by Sustarian Living at https://www.sustarianliving.com/vietnamese-summer-salad-with-dungeness-crab/