Can condensed milk or sour cream be substituted for heavy in a of asparagus soup?

No, condensed milk or sour cream would not be suitable substitutes for heavy cream in an asparagus soup. Condensed milk is sweetened, which would significantly alter the flavor of the soup. Similarly, sour cream is tangy and could clash with the delicate flavor of asparagus.

If a richer texture is desired, one could consider other alternatives such as coconut milk, cashew cream, or almond milk. Alternatively, pureeing a portion of the cooked asparagus can create a naturally creamy consistency without additional thickening.