Add a splash of olive oil to a medium saucepot and heat over medium heat. Add the onions and saute until translucent, about 5 minutes. Add the farro and toast for another few minutes until it smells nutty. Add the white wine and reduce by half. Season with salt and stir.
Start to add the lobster stock by the ladleful, stirring occasionally and cooking until starting to thicken. Keep adding more stock as the liquid gets absorbed. Once thickened, after about 30 minutes, stir in the peas, crab, Parmesan, butter, pea shoots, marjoram, parsley, chives and lemon zest and juice. Use a wooden spoon to whip by hand until creamy, a couple of minutes. Serve in bowls.
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