Some clarifications about a few of the Veggie words:
1. The more common pronunciation of "sili" is similar to how we pronounce the ending of "lalaki". That is, although the vowel is "i", the pronunciation is somewhere between the sound of "e" and "i" and may actually be closer to the sound of "e" than of "i".
2. It is true that some of us would call "kintsay" as celery in English. However, if you'd go to the market and ask for "kintsay", what you would most likely get is coriander or cilantro. If what you need is celery, just ask for "celery" and that's what they'd give you.
3. I have not actually heard of anyone use "oliba" for "olive". I only hear "olives" or "olive" or "oliva" (Spanish).
4. "Puso ng saging" (heart of the banana) is correct as "banana blossom" in English. It is sometimes used as an ingredient in "kare-kare". However, I don't think we use the English translation for it at all. When we say "bulaklak ng saging" (banana flower, which may also translate to "blossom"), what we refer to are the dried ones that are used in some dishes of, perhaps, Chinese origin.
5. Although we actually pronounce it as "pechay", we spell it as "petsay". That's because the old Pilipino alphabet did not include the letter "C" so, to produce the "ch" sound, we spell it as "ts". Now, when we just say "petsay/pechay", what we mean is that which is sometimes called "petsay Tagalog" and it looks like a type of Swiss chard. The Chinese cabbage is also a type of "petsay", but if that's what we mean, we'd call it "petsay Baguio".
Baguio is a city up in the mountains in the northern part of the country. It used to be known as the "summer capital of the Philippines" and the president also has a mansion there where until some decades ago, he would actually hold office at times during the summer months so as to avoid the summer heat in Manila. Because of the colder climate there, some vegetables were considered endemic to the place. Thus, the name "Baguio" got attached to them. We still say "petsay Baguio". Some people still call the green beans as "Baguio beans" and the iceberg lettuce used to be called "Baguio lettuce" or "litsugas Baguio", but since it has already become quite common, it's just called "lettuce" or "litsugas" nowadays. And similarly, we pronounce it as "lichugas", from the Spanish "lechuga".