Video VFX Graph - Interval between spawning in a burst

Hi everyone!
I'm using VFX Graph, and I need to have a single burst where particles are not spawned all at once but with an interval between them, how can I achieve that?

Also to avoid XY problem, the incentive for that is I have an effect (Fireball) where flames are spawned at a rate, and I don't want a lot of delay between the effect starts to when it's fully flaming (and I don't want to increase the general rate), So I want the effect to feel like it's starting from the t=1 or something, so I thought adding a burst at the start that initialized the effect with flames would solve that, what do you think?

Thanks everyone in advance

 

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As this topic comes first in Google search I'll reply here.

I'm still new to the VFX graph, but in my case, I did lifetime delay according to particle ID, and then with GPU event I spawn rendered particles.