The Hoops keeper made a point-blank save from Colin Nish before denying the former Kilmarnock striker late on in another dominant display.
And with Georgios Samaras and Gary Hooper producing two smart finishes at the other end, Lennon's side claimed their fifth consecutive SPL league victory and moved seven points clear at the top of the table.
Lennon said: "Overall I'm pleased with the performance on a difficult pitch, it was quite rutted and bobbly.
"We have to adapt at times better to the conditions but we had two real bits of quality to win the game.
"I had to rely on my goalkeeper to make a fantastic save. We have seen that time and time again - it was another wonderful point-blank save.
"Thankfully he was able to keep a clean sheet and we went on to win with a superb individual goal again from Hooper.
"I didn't think we started the second half well at all but when James Forrest came on he just gives a better balance to the team and it's a great win for us."
Meanwhile, Lennon defended Kelvin Wilson after television pictures showed the centre-back had caught Dundee striker John Baird with an arm late in the first half.
Baird needed treatment but referee Iain Brines took no action over the off-the-ball incident.
Lennon had not seen it but said: "What he is saying is the guy had hold of his arm and he has basically pushed his hand away.
"The boy Baird was nipping away at the players all night and barging into them.
"Now, if Kelvin has been deemed to have acted badly retrospectively, we will deal with it if and when it comes.
"But our discipline has been excellent and Kelvin has been a model pro since he walked in the door, and it's not like him.
"So I'm pretty sure if it does look bad then it's not deliberate."