Give it a great quantity of Warm Amber
From Fallen London Wiki
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From: Slime and Amber: the Rubbery Men
When it sees the quantity you have for it, the Rubbery Man clasps its tendrils and squeezes in a kind of rapt rhythmic reverie. Is it pleased? You think it's pleased.
Game Instructions: This will gain Nodule of Trembling Amber.
Unlocked with 
100 x Nodule of Warm Amber
Success
Great globs of slime
The slime, however, smells pleasant: a lemony scent tinged with something peppery. And the amber at its heart is an unusual colour...
You've lost 100 x Nodule of Warm Amber
You've gained 1 x Nodule of Trembling Amber
You've gained 1 Favours: Rubbery Men (up to 7)
