The jam textures are currently made by me (i cannot art).

This is the current texture for the jam jar item (it's overlayed on top of a glass bottle texture and tinted according to the jam's ingredients):

We need something with the same shape, but with some shading, like in this example from sandwichable:

We also need a block texture (16x16) to be rendered inside the jam jar (currently using white wool) in the same fashion - white with some white shading

@Jomlom DM me and I can send you the existing textures if you can't get them off of here

Done.