How to make a vegetarian coffee jelly?
I've used agar agar before with this recipe. Although I've never tried it myself with coffee beans, the trick might be to use instant coffee, which is what I find is almost the case with other desserts with coffee flavor. I also add 1 teaspoon of vanilla essence right at the end, which lifts the flavor and also sieve before letting it set. I generally put it in the fridge and speed up the setting process.