To make a Prismatic Burger in Grow a Garden (Roblox), you need a specific mix of ingredients and then cook them together at the cooking pot/station.

Quick answer

Use this ingredient combo in the cooking pot:

  • 3 Bone Blossoms
  • 1 Corn (often Violet Corn in some guides, but basic “corn” also works in-game)
  • 1 Tomato

Put all five into the cooking pot at once to get a Prismatic Burger.

Working recipes (what players use)

Different guides and creators describe slightly different “paths” to a Prismatic Burger, but they all agree on the core pattern: Bone Blossoms + corn‑type + tomato.

Commonly used prismatic recipe

  • x3 Bone Blossoms
  • x1 Corn (or Violet Corn)
  • x1 Tomato

Steps:

  1. Grow or obtain 3 Bone Blossoms, 1 Corn, and 1 Tomato.
  1. Go to the cooking pot/cooking station (where you feed Crisp P / the burger NPC).
  1. Put all 5 ingredients into the pot at the same time.
  2. Confirm the cook; the output should be a Prismatic Burger if all items are accepted.

Some written guides also list an alternate “fancy” prismatic recipe using rarer crops:

  • x1 Sugarglaze
  • x1 Grand Tomato
  • x3 Bone Blossoms

This variant is aimed at players with high‑tier crops; functionally, it’s still “tomato + corn‑slot + Bone Blossoms” but at higher rarity.

How the burger rarities work

Guides and videos group burgers by rarity and only change the ingredient rarity/amount , not the overall structure.

  • Legendary Burger: 1 Pepper + 1 Corn + 1 Tomato.
  • Mythical Burger: 1 Pepper + 1 Corn + 1 Tomato + 1 Bone Blossom + 1 Beanstalk.
  • Divine Burger: 1 Corn + 1 Tomato + 3 Bone Blossoms.
  • Prismatic Burger: 3 Bone Blossoms + 1 Corn + 1 Tomato.

Forum players also speculate that output rarity scales with the average rarity of the ingredients you use (e.g., Dragon Pepper, Grand Tomato, Violet Corn, etc.), which is why some recipes swap in rarer versions of the same “slots.”

Tips to get ingredients and better rewards

  • Bone Blossom
    • Used in almost every high‑end burger; farm it as soon as you unlock it.
  • Corn / Violet Corn / Sugarglaze / Grand Tomato
    • Often tied to cooking‑update seeds, events, or rewards from turning in foods to the chef NPC or special seed packs.

For bigger payouts:

  • Use larger / higher‑rarity versions of each ingredient (giant crops, rarer variants). This improves reward quality and sometimes quantity.
  • Time your cooking with events and boosters so you can farm rare seeds and essences faster.

Mini story-style example

You plant Corn, Tomato, and Bone Blossom in your plot and wait until you grow a chunky, high‑rarity batch.
You harvest 3 shiny Bone Blossoms, a nice Corn, and a ripe Tomato, then head over to the steaming cooking pot.
Toss all five into the pot, hit cook, and watch as the output icon flashes into a radiant Prismatic Burger ready to hand in for top‑tier rewards.

TL;DR:
For a reliable Prismatic Burger, use 3 Bone Blossoms + 1 Corn + 1 Tomato in the cooking pot; if you have rarer variants (Violet Corn, Grand Tomato, Sugarglaze), you can swap those in for even fancier prismatic results and better rewards.

Information gathered from public forums or data available on the internet and portrayed here.