Gather your ingredients: Get your frozen pineapple, ice cream/yogurt, pineapple juice, and those optional sweeteners and lemon juice ready to go.
Into the blender they go: Carefully add the frozen pineapple chunks, the half cup of vanilla ice cream or frozen yogurt, the pineapple juice, and if you're using them, the honey/maple syrup and lemon juice into your high-speed blender or food processor. Don't overload it!
Blend until smooth and creamy: Secure the lid and start blending on a low speed, gradually increasing to high. You'll need to use the tamper (if your blender has one) or stop and scrape down the sides with a spatula multiple times. This is key to getting that perfect smooth, creamy texture without adding too much liquid. Keep blending and scraping until there are no chunks left and it looks like soft-serve.
Serve or firm up: For a beautiful soft-serve texture like you see in the photos, immediately scoop or transfer the mixture to a piping bag and pipe it into bowls or cones. If you prefer a firmer, more scoopable consistency, transfer the blended mixture to a freezer-safe container and pop it in the freezer for 1 to 2 hours. Don't leave it much longer, or it will freeze solid!