• Traditional Fermented Foods:
• Tempeh: A traditional Indonesian staple food made by solid-state fermentation of soaked, dehulled, and cooked soybeans bound into a solid white cake by the dense mycelium of the zygomycete fungus Rhizopus oligosporus (or Rhizopus oryzae).
• Other Listed Foods:
• Miso: Traditional Japanese fermented paste made from soybeans fermented with the mold Aspergillus oryzae (koji) and salt.
• Kefir: Fermented milk beverage originating from the Caucasus, made using kefir grains (lactic acid bacteria and yeasts).
• Pepperoni: Dry fermented sausage made from cured beef and pork.
• Conclusion: Tempeh is the Indonesian fermented soybean cake (Option 4).

Correct option: (4) Tempeh