if you're not hungry right after, are you hungrier the next day? if so, just eat the extra calories the day before/after your workout. make sure it averages out to where you want to be and don't sweat that you're eating a little less on your workout day. try and make sure you're getting to at least 1000 cals on the workout day though.
you may also want to try drinking your calories after a workout. so instead of trying to eat, blend up a smoothie and sip at that. something basic like frozen fruit, juice/milk [or water if you need to cut calories, which isn't the case at the moment] and yogurt is a fairly simple starting place. or you could do bananas and peanut butter and maybe a little chocolate and some milk. or you could get into some of the more complex recipes.
the other thing to do on workout days is to rely on more calorie dense foods. in other words, this is not the day to plan soup and salad. so look to recipes that use avocado, peanut butter, pasta or rice, oils, cheese and plan those for workout days. i'm not saying you need to deep fry an avocado and eat that by any means. but just that an ounce of pasta is 100 cals and around half a cup or so. that's a much smaller amount of food than eating 100 cals of lettuce and cucumber. so you want to have the pasta with the veggies and the lean protein and perhaps this is a good night to make pesto instead of having marinara with the veggies. or if you like sausage, this is the day to have it. have some veggies too, but focus on having them with more calorie dense things so that you're not having to wade through a huge volume of food to get the calories you need in.
-google first. ask questions later.