My wife (Korean lady) says there are many wide bladed grasses that can be used for different dishes. She also informs me that namul “Korean spinach”, so you’re safe with substituting spinach for it.
And, yes, there is a wide variety of kimchi. When I lived in Korea, a number of my fellow foreigners and I referred to the radish version as “restaurant kimchi” because it’s one of the side dishes always served in restaurants. What most foreigners think of as the only kind of kimchi is the spiced fermented cabbage type (it’s super red, you know, as a warning against consuming it).
How do you determine which type of kimchi is not too spicy for you? Basically, you take your chances. From the link above, there’s a list of some types of kimchi:
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Baechu-kimchi (배추김치) spicy napa cabbage kimchi, made from whole cabbage leaves
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Baechu-geotjeori (배추겉절이) unfermented napa cabbage kimchi
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Bossam-kimchi (보쌈김치) wrapped kimchi
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Baek-kimchi (백김치) white kimchi, made without chili pepper
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Dongchimi (동치미) a non-spicy watery kimchi
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Nabak-kimchi (나박김치) a mildly spicy watery kimchi
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Chonggak-kimchi (총각김치) cubed chonggak “ponytail” radish, a popular spicy kimchi
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Kkakdugi (깍두기) spicy cubed Korean radish strongly-scented kimchi containing fermented shrimp
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Oi-sobagi (오이소박이) cucumber kimchi that can be stuffed with seafood and chili paste, and is a popular choice during the spring and summer seasons
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Pa-kimchi (파김치) spicy green onion kimchi
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Yeolmu-kimchi (열무김치) is also a popular choice during the spring and summer, and is made with yeolmu radishes, and does not necessarily have to be fermented.
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Gat-kimchi (갓김치), made with Indian mustard
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Yangbaechu-kimchi (양배추 김치) spicy cabbage kimchi, made from “headed” cabbage leaves (as opposed to napa cabbage)
I’d go for yeolmu-kimchi (the non fermented type), baek-kimchi, or dongchimi. If you’re at a restaurant, they should definitely have yeomu-kimchi (aka “restaurant kimchi”), and perhaps the other two available if you request them and they have it for the Korean staff.
An interesting thing to note is that, IME, northern versions (Seoul and north–all the way into the Korean-speaking area of China) doe not use salted shrimp, anchovy, or croaker in producing the traditional red spicy cabbage stuff, while south of Seoul, one or the other will be used, depending on how the mother, grandmother, etc. taught the person making it. (When my dad was stationed in Seoul, my mother learned how to make the spicy red stuff from her maid, who was from way up north of Pyeongyang, so she didn’t use the salted fish.) Store-bought stuff in bags will usually have shrimp as an ingredient.
Anyway, what other fun Korean street foods do you want to try? I think this thread has some great suggestions. I personally recommend the bungeoppang (fish shaped, custard filled pastries) and hoddeok (filled pancake) for desserts. And, you’ll be in for a real treat if you try what Koreans call “toast” (pronounced the way many of us raised in Dixie pronounce “toaster”); it’s essentially a grilled cheese sandwich on steroids. You can check their menu here for ideas if you want to make “toast” at home. Most of the franchisees I’ve seen while in Korea have had more, much more, on offer than that menu.