ETYMOLOGY
from taste (n.) + -some
EXAMPLE
“… Laugh not at me, Herr Norton, ‘the good digestion waits on appetite, and health on both.’ Ate I never anything more tastesome, — say you not so?” said fraulein amiably. …”
From: A Georgian Bungalow
by Frances Courtenay Baylor, 1900
Lexicophilia 