Obviously, any substitutes will alter the flavor. However, there are several gochujang substitutes you could try, including: 1. Sriracha (a similar tangy, spicy flavor but thin in consistency) 2. Harissa paste (North African chili paste with a slightly smoky, sweet, spicy flavor) 3. Biber Salcas (Turkish red pepper paste with a thick texture and moderate heat) 4. La doubanjiang (Chinese spicy bean paste has a similar texture but a milder, sweeter flavor)