Nasi goreng, rendang and gado-gado can all be made with Japanese supermarket ingredients and a few swaps. Halal meat is easy to buy online or at halal shops in most cities.
Large supermarkets and KALDI sell coconut milk, sambal-style chili sauce and sometimes kecap manis. Halal shops (ใใฉใผใซใทใงใใ) sell halal chicken and beef, tempeh and Indonesian sauces. Online shops have everything.
Kecap manis
KALDI, halal shops
If not: Soy sauce with brown sugar, simmered until thick
Sambal oelek
KALDI, halal shops
If not: Doubanjiang (่ฑๆฟ้ค) with a little vinegar
Terasi (shrimp paste)
Halal shops, online
If not: Anchovy paste (ใขใณใใงใใใผในใ)
Shallots
Rarely sold; note that ใจใทใฃใฌใใ in Japan is a young rakkyo, not a shallot
If not: Red onion or onion (็ใญใ)
Candlenuts (kemiri)
Halal shops
If not: Macadamia nuts
Galangal (lengkuas)
Hard to find
If not: Fresh ginger (็ๅง)
Coconut milk (ใณใณใใใใใซใฏ)
Ethnic shelf; cheapest at Gyomu Super
Tempeh (ใใณใ)
Health food shops, KALDI, halal shops
Halal chicken and beef
Halal shops, Gyomu Super (some branches), online
Kerupuk (prawn crackers)
Snack aisle as ใใณใใ
Lazy Recipe sees that you're in Japan, picks swaps from Japanese supermarkets, and your shopping list shows each item's Japanese label and aisle. Type a dish or snap a photo.