How to achieve translucent pomegranate material? Wanting to model a pomegranate kernel, I modelled two objects


The outer shell (red outer watery covering)
The seed (inner opaque whitish seed)





The seed



I want this to be opaque, but I don't want it's edge to have 100% opacity. I want it to blend with the outer shell more.

The outer shell



I played with IOR, transmission, alpha, subsurface scattering, roughness and specular.
I reached a point where I know what all these terms mean but I still am very indecisive to move forward. I feel there is something that I am doing wrong. 


Desired result



Conclusion

I looked at various transparency node settings, tried using them but I am still not getting the fundamentals of nodes. How to use a particular node, how to decide which one to use over the other and how to cascade two or more nodes.

I am relatively new to CG, there are a lot of things that I am not aware of, nodes being one of them. Any sort of help or introduction to new concepts or link to articles/videos is welcomed.
Let's think like a photographer.




Proper lighting is essential - white background, strong backlight, fitting HDRi
Shader - Principled BSDF will do (let's keep it simple)
Use post-processing - adjusting midtone contrast, color-corrections




Outer Seed shader:


Roughness - pretty low, it needs to reflect environment and not
obstruct transmission
Clearcoat - just an artistic choice, as the outer seed has a thin glossy skin
Transmission - full 1
IOR - 1.6
Trans. rougness - 0,1 to distort the light a bit more




Notes:
When going for proper realism you'd use Volumetrics, Subsurface scattering and some textures for a more organic look.

But all things considered, proper lighting is everything here :).