Method
Remove the flower ends from the feijoas and dice the whole fruit. Peel, core, and dice the apples; peel and dice the onions. Zest and juice the lemon; seed and finely chop the chilies.
Combine all ingredients in a large nonreactive pot. Stir and heat over medium heat until bubbling.
Cover and simmer on low for 3 to 4 hours. During the final hour remove the lid and stir frequently until rich brown and thick enough that a spoon trail closes slowly.
Transfer hot chutney to clean heat-safe jars, cool on a heatproof surface, and label.
The source provides hot-fill directions but no validated canning process. Refrigerate promptly or freeze with suitable headspace. Do not store this version at room temperature.