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Peel and finely chop the onion and garlic cloves. Peel and finely grate the ginger root. Crush the peppercorns using the side of your chef's knife or bottom of a pan.
Combine chopped onion, garlic and ginger with black pepper, passata, soy sauce, sambal and sesame oil in the bowl of your crockpot.
Add the chicken thighs and make sure they're completely coated with the sauce.
Set the crockpot to the lowest setting and after about 4 hours the chicken will be so tender it will fall off its bones. It won't be needed to season your sauce with salt, because the soy sauce and cashew nuts are probable salty enough.
Serve with rice, cashew nuts, cooked greens beans and krupuk, enjoy!