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Combine squid, salt, soy sauce, and vinegar in a bowl. Mix well. Marinate for 12 minutes.
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Heat oil in a cooking pot. Saute garlic until it starts to turn light brown. Add onion and tomato. Continue to saute until onion and tomato completely softens.
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Pour the marinade liquid into the pot. Add ground black pepper. Let boil and then cook for 3 minute using low to medium heat. Make sure to cover the pot.
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Add the squid. Let the sauce boil. Cover the pot and continue cooking for 3 minutes.
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Add sugar. Stir. Remove the squid from the pot and then arrange in a bowl. Continue cooking the sauce until it reduces to half.
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Pour the sauce over the squid. Serve. Share and enjoy.