Where does “salaattisipuli” come from?

salaattisipuli (Finnish) comes from Finnish salaatti, from Swedish sallad, from French salade, from Italian salada, from Vulgar Latin salata, from Latin Salo, from Latin saliō, from Latin sāl — salt.

salaattisipuli (Finnish): Spanish onion large and sweet-tasting cultivar of onion chiefly consumed fresh in salads

Definitions

Spanish onion large and sweet-tasting cultivar of onion chiefly consumed fresh in salads

Ancestry of “salaattisipuli”, step by step

salaattisipuli traces back through two separate lines of ancestry.

via Finnish salaatti

Step	Language	Word	Meaning
1	Finnish	salaatti	salad; lettuce; any plant of the genus "Lactuca"
2	Swedish	sallad	salad; vegetables consisting of leaves, typically...
3	French	salade	salad; sallet
4	Italian	salada	—
5	Vulgar Latin	salata	salted
6	Latin	Salo	that flows near Bilbilis and then into the Iberus, now the Jalón
7	Latin	saliō	to leap, jump, bound
8	Latin	sāl	salt
9	Proto-Italic	sāls	salt
10	Proto-Indo-European	*sḗh₂l	salt

via Finnish sipuli

Step	Language	Word	Meaning
1	Finnish	sipuli	onion, "Allium cepa"; onion; onion, Allium
2	Old Swedish	sipul	red onion
3	Middle Low German	sipolle	—
4	Latin	cēpulla	onion-bed, onion-field
5	Latin	-ulus	Used to form a diminutive of a noun, indicating...

Every word from Proto-Indo-European *sḗh₂l →Every word from Proto-Italic sāls →Every word from Latin sāl →