Ok before we start I use procreate, it costs 9.99 usd you can only get it on Apple (yeah ikr I feel the same way android users) but yeah here we go this isn't my best example, I mean, I'm doing this lying in my bed when I'm supposed to be sleeping..

Step 1 choose any shades of red orange and yellow and sequence them like this

Step 2 click on liquify

Step three the mode should be twirl left

Step 4 then set up the size, pressure, and those stuff

Step 5 play around until you get what you want

Hope you like it!